The Sigma Protocol

A missing murder victim; an agent declared rogue. Someone wants a secret kept, no matter what the cost...A superb standalone thriller from the internationally bestselling author of the Bourne series.

Ben Hartman is on holiday in Switzerland when he meets a childhood friend - who promptly tries to kill him. In self-defence, Ben kills his attacker, but soon the body and all evidence of the confrontation have disappeared.

Anna Navar