Handwritten Letter is a Note in Deathloop.
Location
Found in a Dishonored 2-styled cabinet in Lila Blake's Apartment in Karl's Bay. It can be accessed only from Vanya's Restaurant. To enter it Colt has to tamper with the Smoke Machine in the Morning for Vanya to survive.
Transcript
Mr. Colt Vahn,
My mad, magnificent bastard.
I see you striding Karl's Bay in your flight suit, and I also want to strip it off.
Because of what I want from you (obviously!), but also because of what THEY want from you.
You say this mission's the only way to regain your rank — and you're probably right.
But a posthumous promotion's a shaky foundation for a family.
Last night I dreamt of you arching across the sky, entering that THING.
An impossibly bright flash, and then — who can say?
Perhaps it shreds your skin and bones. Perhaps dissolves you into smoke and flame. Nobody knows.
But here you go, flinging yourself into the maw.
Which is to say that — despite your every obnoxious habit — I hope desperately that these words will call you back to me.
And if you don't survive this, I'll fucking kill you.
Yours always and forever,
Ms. Lila Blake
Colt Note
Lila Blake begged you to come back alive from a dangerous flight. For her and your future family.