Set during the 1960s in the fictional North Yorkshire village of Aidensfield, this enduringly popular series interweaves crime and medical storylines.

Jack Williams was the best friend of Vietnam veteran and detective Mike Hammer. When Jack is murdered, Mike makes it his business to solve the crime. He is helped by his secretary Velda, and partly helped, partly hindered by the Chief of Police, Pat Chambers. On the trail of the killer, Mike discovers government conspiracies, and plots used by the CIA and the Mafia.

To maintain his powers, the evil wizard Traigon must sacrifice his firstborn child to the god Caligara. His wife, however, has other ideas and runs away after giving birth with her twin daughters. Before dying, she hands the girls over to the warrior Krona who promises to raise them as great soldiers. Twenty years later, Traigon returns and begins hunting down his daughters once again. Will the twins, with the help of the Barbarian Erlik and the Viking Baldar, be able to defeat their father?