diff --git a/src/App.tsx b/src/App.tsx
index f17cd10..dc4db69 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -3,6 +3,7 @@ import { Feed } from "./components/feed/Feed";
 import { RelaysView } from "./components/shared/RelaysView";
 import { SettingsView } from "./components/shared/SettingsView";
 import { ProfileView } from "./components/profile/ProfileView";
+import { ThreadView } from "./components/thread/ThreadView";
 import { useUIStore } from "./stores/ui";
 
 function App() {
@@ -16,6 +17,7 @@ function App() {
         {currentView === "relays" && <RelaysView />}
         {currentView === "settings" && <SettingsView />}
         {currentView === "profile" && <ProfileView />}
+        {currentView === "thread" && <ThreadView />}
       </main>
     </div>
   );
diff --git a/src/components/feed/NoteCard.tsx b/src/components/feed/NoteCard.tsx
index 9872eb1..553bf34 100644
--- a/src/components/feed/NoteCard.tsx
+++ b/src/components/feed/NoteCard.tsx
@@ -19,7 +19,7 @@ export function NoteCard({ event }: NoteCardProps) {
   const time = event.created_at ? timeAgo(event.created_at) : "";
 
   const { loggedIn } = useUserStore();
-  const { openProfile } = useUIStore();
+  const { openProfile, openThread, currentView } = useUIStore();
   const likedKey = "wrystr_liked";
   const getLiked = () => {
     try { return new Set<string>(JSON.parse(localStorage.getItem(likedKey) || "[]")); }
@@ -109,7 +109,12 @@ export function NoteCard({ event }: NoteCardProps) {
             <span className="text-text-dim text-[11px] shrink-0">{time}</span>
           </div>
 
-          <NoteContent content={event.content} />
+          <div
+            className="cursor-pointer"
+            onClick={() => openThread(event, currentView as "feed" | "profile")}
+          >
+            <NoteContent content={event.content} />
+          </div>
 
           {/* Actions */}
           {loggedIn && (
diff --git a/src/components/profile/ProfileView.tsx b/src/components/profile/ProfileView.tsx
index e89d81d..a510a31 100644
--- a/src/components/profile/ProfileView.tsx
+++ b/src/components/profile/ProfileView.tsx
@@ -7,7 +7,7 @@ import { shortenPubkey } from "../../lib/utils";
 import { NoteCard } from "../feed/NoteCard";
 
 export function ProfileView() {
-  const { selectedPubkey, setView } = useUIStore();
+  const { selectedPubkey, goBack } = useUIStore();
   const pubkey = selectedPubkey!;
   const profile = useProfile(pubkey);
 
@@ -33,7 +33,7 @@ export function ProfileView() {
       {/* Header */}
       <header className="border-b border-border px-4 py-2.5 flex items-center gap-3 shrink-0">
         <button
-          onClick={() => setView("feed")}
+          onClick={goBack}
           className="text-text-dim hover:text-text text-[11px] transition-colors"
         >
           ← back
diff --git a/src/components/thread/ThreadView.tsx b/src/components/thread/ThreadView.tsx
new file mode 100644
index 0000000..ec36b92
--- /dev/null
+++ b/src/components/thread/ThreadView.tsx
@@ -0,0 +1,146 @@
+import { useEffect, useRef, useState } from "react";
+import { NDKEvent } from "@nostr-dev-kit/ndk";
+import { useUIStore } from "../../stores/ui";
+import { useUserStore } from "../../stores/user";
+import { useProfile } from "../../hooks/useProfile";
+import { fetchReplies, publishReply } from "../../lib/nostr";
+import { shortenPubkey, timeAgo } from "../../lib/utils";
+import { NoteContent } from "../feed/NoteContent";
+import { NoteCard } from "../feed/NoteCard";
+
+function RootNote({ event }: { event: NDKEvent }) {
+  const { openProfile } = useUIStore();
+  const profile = useProfile(event.pubkey);
+  const name = profile?.displayName || profile?.name || shortenPubkey(event.pubkey);
+  const avatar = profile?.picture;
+  const nip05 = profile?.nip05;
+  const time = event.created_at ? timeAgo(event.created_at) : "";
+
+  return (
+    <div className="px-4 py-4 border-b border-border">
+      <div className="flex gap-3 mb-3">
+        <div className="shrink-0 cursor-pointer" onClick={() => openProfile(event.pubkey)}>
+          {avatar ? (
+            <img src={avatar} alt="" className="w-10 h-10 rounded-sm object-cover bg-bg-raised hover:opacity-80 transition-opacity" />
+          ) : (
+            <div className="w-10 h-10 rounded-sm bg-bg-raised border border-border flex items-center justify-center text-text-dim text-sm">
+              {name.charAt(0).toUpperCase()}
+            </div>
+          )}
+        </div>
+        <div>
+          <span
+            className="text-text font-medium text-[13px] cursor-pointer hover:text-accent transition-colors"
+            onClick={() => openProfile(event.pubkey)}
+          >{name}</span>
+          {nip05 && <div className="text-text-dim text-[10px]">{nip05}</div>}
+        </div>
+      </div>
+      <NoteContent content={event.content} />
+      <div className="text-text-dim text-[10px] mt-3">{time}</div>
+    </div>
+  );
+}
+
+export function ThreadView() {
+  const { selectedNote, goBack } = useUIStore();
+  const { loggedIn } = useUserStore();
+  const event = selectedNote!;
+
+  const [replies, setReplies] = useState<NDKEvent[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [replyText, setReplyText] = useState("");
+  const [replying, setReplying] = useState(false);
+  const [replySent, setReplySent] = useState(false);
+  const replyRef = useRef<HTMLTextAreaElement>(null);
+
+  useEffect(() => {
+    fetchReplies(event.id).then((r) => {
+      setReplies(r);
+      setLoading(false);
+    }).catch(() => setLoading(false));
+  }, [event.id]);
+
+  const handleReply = async () => {
+    if (!replyText.trim() || replying) return;
+    setReplying(true);
+    try {
+      await publishReply(replyText.trim(), { id: event.id, pubkey: event.pubkey });
+      setReplyText("");
+      setReplySent(true);
+      // Re-fetch replies to show the new one
+      const updated = await fetchReplies(event.id);
+      setReplies(updated);
+      setTimeout(() => setReplySent(false), 2000);
+    } finally {
+      setReplying(false);
+    }
+  };
+
+  const handleKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === "Enter" && (e.ctrlKey || e.metaKey)) handleReply();
+    if (e.key === "Escape") replyRef.current?.blur();
+  };
+
+  return (
+    <div className="h-full flex flex-col">
+      {/* Header */}
+      <header className="border-b border-border px-4 py-2.5 flex items-center gap-3 shrink-0">
+        <button
+          onClick={goBack}
+          className="text-text-dim hover:text-text text-[11px] transition-colors"
+        >
+          ← back
+        </button>
+        <h1 className="text-text text-sm font-medium">Thread</h1>
+      </header>
+
+      <div className="flex-1 overflow-y-auto">
+        {/* Root note */}
+        <RootNote event={event} />
+
+        {/* Reply composer */}
+        {loggedIn && (
+          <div className="border-b border-border px-4 py-3">
+            <textarea
+              ref={replyRef}
+              value={replyText}
+              onChange={(e) => setReplyText(e.target.value)}
+              onKeyDown={handleKeyDown}
+              placeholder="Write a reply…"
+              rows={2}
+              className="w-full bg-transparent text-text text-[13px] placeholder:text-text-dim resize-none focus:outline-none"
+            />
+            <div className="flex items-center justify-end gap-2 mt-1">
+              <span className="text-text-dim text-[10px]">Ctrl+Enter</span>
+              <button
+                onClick={handleReply}
+                disabled={!replyText.trim() || replying}
+                className="px-3 py-1 text-[11px] bg-accent hover:bg-accent-hover text-white transition-colors disabled:opacity-30 disabled:cursor-not-allowed"
+              >
+                {replySent ? "replied ✓" : replying ? "posting…" : "reply"}
+              </button>
+            </div>
+          </div>
+        )}
+
+        {/* Replies */}
+        {loading && (
+          <div className="px-4 py-6 text-text-dim text-[12px] text-center">
+            Loading replies…
+          </div>
+        )}
+
+        {!loading && replies.length === 0 && (
+          <div className="px-4 py-6 text-text-dim text-[12px] text-center">
+            No replies yet.
+          </div>
+        )}
+
+        {replies.map((reply) => (
+          <NoteCard key={reply.id} event={reply} />
+        ))}
+      </div>
+    </div>
+  );
+}
diff --git a/src/lib/nostr/client.ts b/src/lib/nostr/client.ts
index e78cd7b..96ae64d 100644
--- a/src/lib/nostr/client.ts
+++ b/src/lib/nostr/client.ts
@@ -99,6 +99,18 @@ export async function publishNote(content: string): Promise<void> {
   await event.publish();
 }
 
+export async function fetchReplies(eventId: string): Promise<NDKEvent[]> {
+  const instance = getNDK();
+  const filter: NDKFilter = {
+    kinds: [NDKKind.Text],
+    "#e": [eventId],
+  };
+  const events = await instance.fetchEvents(filter, {
+    cacheUsage: NDKSubscriptionCacheUsage.ONLY_RELAY,
+  });
+  return Array.from(events).sort((a, b) => (a.created_at ?? 0) - (b.created_at ?? 0));
+}
+
 export async function fetchFollowFeed(pubkeys: string[], limit = 80): Promise<NDKEvent[]> {
   if (pubkeys.length === 0) return [];
   const instance = getNDK();
diff --git a/src/lib/nostr/index.ts b/src/lib/nostr/index.ts
index 0991dc9..f5e43cd 100644
--- a/src/lib/nostr/index.ts
+++ b/src/lib/nostr/index.ts
@@ -1 +1 @@
-export { getNDK, connectToRelays, fetchGlobalFeed, fetchFollowFeed, publishNote, publishReaction, publishReply, fetchUserNotes, fetchProfile } from "./client";
+export { getNDK, connectToRelays, fetchGlobalFeed, fetchFollowFeed, fetchReplies, publishNote, publishReaction, publishReply, fetchUserNotes, fetchProfile } from "./client";
diff --git a/src/stores/ui.ts b/src/stores/ui.ts
index 28a9dfe..d0a1f56 100644
--- a/src/stores/ui.ts
+++ b/src/stores/ui.ts
@@ -1,21 +1,31 @@
 import { create } from "zustand";
 
-type View = "feed" | "relays" | "settings" | "profile";
+import { NDKEvent } from "@nostr-dev-kit/ndk";
+
+type View = "feed" | "relays" | "settings" | "profile" | "thread";
 
 interface UIState {
   currentView: View;
   sidebarCollapsed: boolean;
   selectedPubkey: string | null;
+  selectedNote: NDKEvent | null;
+  previousView: View;
   setView: (view: View) => void;
   openProfile: (pubkey: string) => void;
+  openThread: (note: NDKEvent, from: View) => void;
+  goBack: () => void;
   toggleSidebar: () => void;
 }
 
-export const useUIStore = create<UIState>((set) => ({
+export const useUIStore = create<UIState>((set, get) => ({
   currentView: "feed",
   sidebarCollapsed: false,
   selectedPubkey: null,
+  selectedNote: null,
+  previousView: "feed",
   setView: (currentView) => set({ currentView }),
-  openProfile: (pubkey) => set({ currentView: "profile", selectedPubkey: pubkey }),
+  openProfile: (pubkey) => set((s) => ({ currentView: "profile", selectedPubkey: pubkey, previousView: s.currentView as View })),
+  openThread: (note, from) => set({ currentView: "thread", selectedNote: note, previousView: from }),
+  goBack: () => set((s) => ({ currentView: s.previousView, selectedNote: null })),
   toggleSidebar: () => set((s) => ({ sidebarCollapsed: !s.sidebarCollapsed })),
 }));