An art professor is informed that the husband she thought died ten years before has just been murdered. So she starts to research her husband's secret life in search of the reason he disappeared and who might have killed him.

In the present a team of four anthropomorphic dinosaurs, created by aliens, must stop three anthropomorphic velociraptors who want to cause a cataclysm that would speed up global warming and make Earth's climate pleasant for dinosaurs again.

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