An insurance investigator tracks a series of robberies to a gang who are hiding the stolen jewels in the produce of a bakery.

Capt. Johnnie Gray is enlisted by Mr. J.G. Reeder to infiltrate a gang of forgers in Dartmoor jail on behalf of the Bank of England.

John Forrest, an insurance investigator with a weakness for model railways, is on the trail of a gang of smash-and-grab thieves targeting Europe's...