Hit Or Myth1966
by Robert Asprin
The apprentice Skeeve is just getting used to his duties as Court Magician of Possiltum. Then King Roderick decides to take a powder, leaving Skeeve in his place to marry his homicidal fiancée and face the Mob's fairy godfather-who makes him an offer he can't refuse.
— from OpenLibrary
10 editions at OpenLibrary