Special agent Paul Chavasse is familiar with undercover missions that no one else will undertake – but none have entailed being sent to prison for seven years.

With commando-like precision, an international escape ring is breaking Britain’s top criminals out of jail. Saboteurs, murderers, traitors, spies – all vanishing without a clue. Special Branch has discovered that Harry Youngblood will be next, but they are helpless to stop it.