Jason King is a crime drama spin-off series from the popular ITC series Department S, starring Peter Wyngarde as the flamboyant playboy investigator and author of his own fictional detective Mark Caine. Forced into working for the government over tax evasion charges by Sir Brian, and his assistant Ryland, King set out on a series of adventures that were more down to earth than his Department S cases. However, it didn't stop him from enjoying an extravagant lifestyle which necessitated fast cars, foreign travel and a bevy of beautiful girls. His publisher is the beautiful Nicola Harvester.
An elite department within Interpol, Department S inherited those cases which the other member groups had failed to solve. The brains of the group was Jason King, a hedonistic maverick who wrote mystery novels and solved real-life crimes by projecting himself into the shoes of his fictional hero, Mark Caine...
Wealthy Texan and former jewel thief John Mannering is now an antiques dealer and agent for British Intelligence. His knowlege of antiques helps him protect the missions he's sent on.