Alan Lomax is an ex-police detective who has just spent two years in prison on a trumped-up bribery charge. On his release, Lomax takes to the canals of England in a narrowboat to track down those responsible for betraying him.
Max is released from prison and returns to London to find that his wife has emigrated and that his son is missing. He leaves London and embarks on his narrowboat Harmony. He takes up with a young woman, Andrea, and sorts out a demanding drug dealer for a former nurse who has become addicted. He gives her the drug dealer's money so she can book herself into a clinic.
Max continues his search, accompanied by Andrea. Max has to visit his sick mother in London. While he is away, Naylor interrogates Andrea about 'The Money' and sets fire to the boat. On his return Max seeks out Naylor at home and warns him off. Naylor gives chase on his motorbike, but ends up crashing through the barriers of an elevated motorway.
Max's quest leads him to a village in Wales, where he immediately comes under suspicion when a local girl goes missing.
A hit man accidentally sends a bullet through a window on Harmony, and Max thinks someone is out to get him.
Max continues his search for Steve, and a girl thinks she recognises him.
Max attends his mother's funeral in London, not knowing that Steve was also there. He meets Neil Pember, a former police colleague.
Robinson asks Max to look after his goddaughter, Billy. A Fleet Street favour ends in tragedy.
Max spends a weekend away from Harmony, looking after a hotel, where the only couple staying are a mystery. Lomax is left to play host to a married couple when he calls on an old friend and, later, becomes involved in a mystery when the wife is abducted.
A birthday barbecue at a Cheshire country house is gate-crashed by a motorcycle gang. Lomax, who is working as a part-time barman, attracts the attention of a tipsy woman, the mother of the party girl, who demands he drive her home. They arrive back at the country house as the police are dealing with the gate-crashing bikers.
Lomax and Steve, Max's son, spend a week together on the canals; Steve challenges Max to prove his innocence. He knows his father needs money to finance his quest and robs a betting shop. However, the shop belongs to local gang boss, Jack Ormand, who sets his heavies on the trail.
It is winter; Lomax, holed up in remote farmland, becomes a suspect in a rustling case. He meets up with an ex-cell mate, Granny Jackson, who gives him a lead to the real thieves.
Lomax is coming closer to the man who framed him. A Fleet Street hack thinks he may be able to help, but most assistance comes from Lomax's girlfriend, Maureen, who gives him the name 'Len Martin', but Martin remains one step ahead.
Lomax at last catches up with Len Martin, the man who framed him, causing his prison sentence and eventual disgrace. A chase ensues. Len Martin dies, impaling himself improbably on an old ship. Max's quest has failed.
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