Mort by Terry Pratchett (Discworld #4)

Death comes to us all. When he came to Mort, he offered him a job.

Death is the Grim Reaper of the Discworld, a black-robed skeleton carrying a scythe who must collect a minimum number of souls in order to keep the momentum of dying, well . . . alive.

He is also fond of cats and endlessly baffled by humanity. Soon Death is yearning to experience what humanity really has to offer . . . but to do that, he'll need to hire some help.

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 Mort falls in love with Death's daughter, Ysabell, and discovers that your boss can be a killer on your love life . . .

Book by author Terry Pratchett.