Letter from Emily is a written note found in Dishonored 2.
By now you must have heard about the Coup in Dunwall. Don't worry, I'm safe, hiding far away with friends. I implore you, don't try anything reckless, and don't go back to Gristol. Stay in Morley. There's nothing you can do against Delilah.
I can't say I have a solid plan yet, but you know how well I improvise in desperate situations. Remember the time I kept a straight face during the Watch Officer's report, all the while sitting at my desk without pants? If I survived that, I'll get through all this.
For now, I need to stay hidden and act alone. Trust me. We'll see each other again, I promise.
The note can be found aboard the Dreadful Wale, on the desk in Emily's room, after she wakes up at the beginning of the mission Edge of the World. An alternative note is found if playing as Corvo Attano.