The Ghost Squad are undercover detective who go deep cover.
One of them has infiltrated the London dockyards to get information on a gang who rob valuable cargo.
However his identity is discovered as he is caught nosing about. A contrived accident lands him in hospital.
DI Maguire take his place as a shady dockyard worker from Canada who is handy with his fists.
Maguire soon finds trouble and is asked to rob a warehouse. That's how good is his cover.
A quick moving thriller. Maguire's contact is a female detective who is also undercover.
Douglas Wilmer roughs it up as a heavy. He usually played smoothies.