The Murder Book (Tom Thorne Book 18), Mark Billingham

Tom Thorne has it all. In Nicola Tanner and Phil Hendricks, Thorne has good friends by his side.

He finally has a love life worth a damn and is happy in the job to which he has devoted his life... He has everything to lose. Hunting the woman responsible for a series of grisly murders, Thorne has no way of knowing that he will be plunged into a nightmare from which he may never wake.

And he'll do anything to keep it. Finally, Thorne's past has caught up with him and a ruinous secret is about to be revealed. If he wants to save himself and his friends, he must do the unthinkable.