Regan is convinced that Eddie Boyse, a recently released career criminal, is responsible for a robbery, but Boyse was with Regan when the crime occurred.

After Danny Keever, a convict on weekend release and due for parole, is framed in a bank robbery, Regan works to clear him.

When a gang hijack an armoured security truck, Regan, Carter and the Flying Squad set up an ambush to catch the crooks. But who's the informer ?

Regan gets involved in gangland warfare following the death of one of London’s leading villains.