Secret Correspondence is a book addressed to Mysus that is found in the Black Market under Lanilor Lane in Aleroth during the events of Divinity II: Flames of Vengeance.

My dear friend Mysus,

Business has been slow in Verdistis ever since some of our best assassins were sent on a mission to Broken Valley village. Extortions have dropped dramatically, not to mention my legitimate warehouse. Doesn't take a genius to figure out coffin sales wouldn't exactly be soaring, which is why I will send one of my men over: a fellow named Dormen. He's a cunning salesman and I'm sure you and he together will turn a fair profit!
With kind affection,

Sir Dante Junior

– Secret Correspondence, Divinity II: Flames of Vengeance