Hackett and team stake out a cargo ship carrying £30,000 in silver. A tip-off from snout Ted Knight points the finger at Jack Maynard. When the stakeout is terminated, the team discover Knight with his throat slit on the dock.

Criminals Dickie Tufnell and Harry Kemp are shot dead in a gangland hit. Hackett learns that the latter had been forced into the robbery by a pair of revolutionaries looking to raise funds.

Hackett's snout Collars is murdered. Inquiries lead to the release of Swain and Lewis from Parkhurst. Target criminal Ruby Daniels' daughter Sam is kidnapped and the abductors want £300,000 in cash. Hackett believes Daniels is connected to the pair.

An informer tells Hackett to go to a squash club where he will find a briefcase in a locker. Leaving, he is approached by Dep. Chief Constable Goddard. Instead of documents, there's £10,000 in cash and Hackett facing suspension.