The unexplained poisoning of a former detective sergeant leads Endeavour and Thursday to a local cinema.

The railway takes center stage as Endeavour investigates the disappearance of a local woman - with initial fears linking it to the unsolved murder of a teenager, killed several years earlier.

A photo-shoot on an army base turns sinister when one of the models is found dead. But the investigation is complicated when Sam Thursday is revealed to be involved.

An assassination attempt at an international sporting event opens a new case for Endeavour and Thursday, but their investigation is quickly brought to an unexpected end.

After the mysterious disappearance of a teacher, Endeavour finds himself investigating the dark and secret world of a public school.