Mort was an awkward farm boy with the horticultural talents of a dead starfish. Eager to send him into a trade that might better suit his dispositions, his family agreed to place him in an apprenticeship with Death. 
 As far as coming of age and first love stories go, this is one of the better ones I've read. That's the major aspect of the Discworld novels I've always liked - they are hilarious, but the stories would still be quite good even without the humour. 
 Like most of the Discworld series, I loved the book right up until the climax. At that point, I usually feel like Pratchett is letting some fumbling inner author take over and I lose interest completely. It's usually a struggle for me to read the last 10-20 pages. 
 Overall, though, I highly recommend Mort as well as just about any other Discworld novel for anyone who enjoys comedy, particularly the more word-play witty humour of Britain rather than the slapstick/situational humour of North America.