Endeavour S04E01 overview: The ‘white heat' of technology takes centre stage in the first film, as Lovelace College is taken over by a team of research scientists who are developing a ‘thinking' machine to equal and even outstrip the capabilities of man's own mind. As a Russian academic prepares to do battle with the Joint Computing Nexus (JCN or Jason for short) in a game of chess, the Cold War is played out on a chequered field and Endeavour and Thursday are plunged into their most perilous, baffling and darkly terrifying case to date. Throwing himself into his work to mask the heartache of Joan's departure, Endeavour is quickly consumed by his duties when one of the research team is found drowned near Magdalen Bridge. Assuming it to be a suicide on first inspection, the circumstances become more suspicious when two more victims are also found drowned nearby in East Cowley Baths. Is there more to the deaths than meets the eye?