Your Lost Diary is a written note found in Dishonored: Death of the Outsider.
Transcript[]
We have yet to locate your personal diary of prophecies and meditations.
The thief, as you know, fled along the catwalk that borders the atrium and to the elevator shaft. Fortunately, she fell to her death. We searched her, but your diary was not found among her effects. She may have concealed it somewhere before she came to her end.
The body of Sister Sian, who died in an attempt to subdue the thief, has been properly attended to. Her remains are on their way to our chapel presently. May her spirit fade and merge with the cosmos.
I am certain that no one has found your diary and neglected to inform us, but I know that if I catch an Overseer reading your private notes, I am within my rights to kill him for his flagrant debasement to the Wandering Gaze.
Yours in faith,
Sister Ramos
Location[]
This note can be found on the terrace on the sixth floor of the Royal Conservatory during the mission The Stolen Archive.