Set from 1965 into the 1970s, the show follows Endeavour Morse in his early years as a police constable. Working alongside his senior partner DI Fred Thursday, Morse engages in a number of investigations around Oxford.
Mie, a woman with amnesia, is visited by DI Wolkers who claims she was the last person seen with the vanished Thomas Spectre. In order to find Thomas, Mie has to reconstruct lost memories and find a way through the labyrinth of her past.