Lifeless (Tom Thorne Book 5), Mark Billingham

A SERIES OF KILLINGS Three men, sleeping rough on London's mean streets, have been found brutally murdered - each victim kicked to death and found with a GBP20 note pinned to his chest. But were they killed at random, or were they targeted for a reason? A DEADLY MISSION Tom Thorne is posted to the same streets - working undercover, disguised as a homeless man. In a harsh and harrowing underworld, Thorne discovers the horrifying link between the homeless victims and the perpetrators of a fifteen-year-old atrocity.

A RUTHLESS ENEMY Those who know are keeping quiet. But the word on these streets is that the killer is a cop...