For more than five years police operations in the southeast of England have been failing. Chief Superintendent Knightly, a senior member of the National Crime Agency, suspects that someone is selling police intelligence. When one of his junior officers dies before he can attend clandestine meeting with him, Knightly is certain—there’s a dirty cop inside his organisation. Unable to trust anyone under his command, Knightly turns to an old friend for help—Detective Chief Inspector David Jones. When Detective Sergeant Phil Cryer, answers his doorbell to find CS Knightly and DCI Jones on his doorstep, he knows things are about to get interesting—and dangerous. Phil Cryer, on sick leave after suffering an injury in the line of duty, soon finds himself deep undercover inside the NCA hunting the dirty cop, codename Alpine. He faces his most difficult and dangerous assignment. Alone, injured, and armed only with his phenomenal memory, Phil must identify the rogue cop before he escapes … or kills again.