A professional hitman bursts into the luxurious family home of accountant Keith Rothwell and shoots him in cold blood. Banks is instantly struck by the strange reactions of the victim's family and evidence comes to light that Rothwell has been living a secret double life. Now investigating the murder of a victim with two identities, Banks and Morton discover a possible link to a major money-laundering operation and are plunged into a high-profile fraud investigation with political ramifications.