Mort: (Discworld Novel 4) (Discworld series)

Death comes to us all. When he came to Mort, he offered him a job. Henceforth, Death is no longer going to be the end, merely the means to an end. It’s an offer Mort can't refuse. As Death's apprentice he'll have free board, use of the company horse - and being dead isn't compulsory. It's a dream job - until he discovers that it can be a killer on his love life...