The first book in the Chronicles of Amber series, written by Roger Zelazny. In it, we are introduced to the character of Corwin, and learn that he is one of the Princes of Amber, powerful beings which can work magic and walk the dimensions, immortals who know how to sway the minds and hearts of beings throughout the Shadows (as the multiverse is called in this series). Corwin embarks on a quest to take the throne of Amber for himself, and exact revenge on one of his brothers, who stole his memories.

A very worthwhile read, not to mention a huge power trip.