Barlow must find a young girl who has disappeared from London Airport.
Fishing for a villain in Amsterdam, Barlow searches for the appropriate bait.
Eddie Doyle is serving a life sentence for murder, but friends in The Potteries think the police may have moved too fast.
A girl has been murdered in the West Country, and routine methods have failed to find her killer. What's needed is something different...
Barlow investigates a racket using car ferries to export stolen vehicles.
When a voice from the past brings Barlow information about a crime, he has to balance his new responsibilities at the Home Office against his detective's judgment.
The policeman look and sound British. But when Barlow follows the trail of a city swindler as far as Rhodesia, he finds them surprisingly unfriendly.
Barlow finds that Signor Rizzi is interested in something more sinister then good trade relations.
The Rock of Gibraltar proves stony ground when Barlow and Rees start 'digging' for treasure. Their hunt for £750,000 worth of stolen and forged securities leads them to all the Rock's attractions - and one of the attractions leads Rees into temptation.
Barlow's relationship with Fenton is never easy - and it is stretched to the limit when Fenton receives and extraordinary confession.
Barlow's involvement in the security arrangements for a number of big open-air pop festivals appears to be routine. But when things go wrong at least one chief constable is glad he's there.
A prominent Jewish industrialist appears to have been kidnapped. Is it a hoax? Or is it the action of Arab guerillas - in which case what exactly do they want?
Even on holiday in Italy Barlow manages to combine business with pleasure - which accounts for his knowledge of and interest in Etruscan art.
Barlow is instructed to make discreet enquiries into the undesirable company being kept by a politician. In the process he meets up with an old adversary and decides, for once, to go it alone.
A series of apparently unconnected explosions reveals a web of intrigue. Barlow's enquiries touch a raw nerve in high places and he takes a big personal risk.
A mysterious call from Special Branch leads Barlow into a cloak-and-dagger world which is, as Fenton warns him, ""shadowy, full of intrigue - and violent"".
The Home Office have received a number of complaints about an apparently harmless religious sect. Barlow's team investigate, with tragic results.