Yennefer's Letter is document in The Witcher 3: Wild Hunt.
You start the game with this letter, and in this opening scene Geralt has the dialogue option to let Vesemir read the note looking for clues about where to find Yennefer. The witchers' search for Yen during the entirety of the prologue of the game is spurred by this letter.
- Dear friend,
- Forgive me for not asking about your health or how you have been these last years. Time is very short.
- I have important news. We must meet, and soon. Ride to Willoughby, near Vizima, and don't spare the horses - while I do eagerly await our reunion, I won't be able to wait, eagerly or otherwise, very long.
- Your dear friend,
- P.S. I still have the unicorn.