Low chaos version of drawing left on the wall of Corvo's chambers in The Loyalists.
A Letter From Emily is a written note found in Dishonored.
Transcript[]
Remember before when I mentioned a special drawing I was working on for you? This is it. I don't know where you went, but I hope when you get back you see this and like it. I'd like to take it to Dunwall Tower with us. Everyone's acting strange tonight. Samuel was whispering to Callista about a flare launcher that she was supposed to use to call him. He told her to lock the door to my old tower. I heard the Admiral tell the others we are leaving tonight for a place called The Lighthouse on Kingsparrow Island. I hope you get back before then.
Location[]
The note can be found in Corvo's room at the Hound Pits Pub next to said special drawing, during the The Loyalists mission.