Dark Side of the Street (Paul Chavasse #5)

With commando-like precision, someone was breaking Britain's most notorious prisoners out of jail, and delivering convicted spies back to the Soviets. His code name was The Baron -- there was just one way to trace him: put a secret operative inside the walls and let the Baron get him out.

To do it the Special Branch needed an agent with the cunning mind of a criminal and the cold heart of a killer. That agent was Paul Chavasse.