Fighting Fantasy: Night of the Necromancer by Steve Jackson (author) and Ian Livingstone (author)

Death is not the end… You are a knightly warrior, returning to your ancestral castle after many years away fighting a crusade. But just within sight of home, you are suddenly struck down by a band of murderers. Driven by the need to know why you have been killed, and at whose demand, you rise again as a ghost. Your adventure begins as you set out to solve the mystery of your own murder, all during the course of one fateful night…