I just finished The Getaway by Jim Thompson.

The Getaway is one of Thompson's most famous noir pieces, following some crooks as they try to escape to Mexico after robbing a bank.

It is justifiably well known for its gritty portrayal of underworld life, violence and betrayal. The story is pretty straightforward, with some compelling, if unappealing, characters and it ends with a surprising twist, one that wasn't included in either movie version, since it is so downbeat and unexpected.