Shaun Evans portrays the cerebral and solitary Detective Constable Morse in Endeavour, written by Inspector Lewis creator and Inspector Morse writer Russell Lewis. The series is, of course, based on the Morse books written by the late Colin Dexter.
Season 4 is set in the summer of 1967, and the effects of the Cold War and sixties counterculture are being felt in Oxford. The four episodes are entitled “Game”, “Canticle”, “Lazaretto” and “Harvest.”
Here's the ITV trailer. Series 4 aired previously in the UK.