The Burning Girl (Tom Thorne Book 4), Mark Billingham

A MAN WHO KILLS FOR MONEY X marks the spot - and when that spot is a corpse's naked back and the X is carved in blood, DI Tom Thorne is in no doubt that the dead man is the latest victim of a particularly vicious killer. A BRUTAL VENDETTA This is brutal turf warfare between north London gangs. Organised crime boss Billy Ryan is moving into someone else's patch, and that someone is not best pleased.

A COP WHO IS PLAYING WITH FIRE And when an X is carved on DI Tom Thorne's front door, he knows the smouldering embers of this case are about to erupt into flames...