Night of the Necromancer (Fighting Fantasy: Wizard 2 #7)

Death is not the end... You are a knightly warrior, returning to your ancestral castle having been away for a number of years fighting a crusade against the forces of darkness in the Mauristatian principality of Bathoria. You are just within sight of home when you are struck down by a band of murderers. Driven by the need to know why you have been killed, and on whose orders, you rise again as a ghost. This is where your adventure begins, as you set out to solve the mystery of your own murder. All that follows occurs during the course of one night.