John Mills tracks down the real culprit of the murder he was sent to jail for in this tense British drama of exile and return. The real murderer is now a comfortable businessman, and the visual contrasts between his dubious offices in the London docks and Mills' derelict boat far out on the river estuary gives a resonance to the film it would be hard to find in a modern setting. Freed from jail but still imprisoned by the past, Mills' character spurns the touching companionship of another refugee on the Kent marshes (Eva Bergh) about whose past we know nothing, but it seems to be destiny that has brought them together. This is one of the few films that resolves a labyrinthine revenge-story without the plot becoming mechanical, and the bleak monochrome visuals are part of its emotional power.