It’s May, 1945 in the glorious Yorkshire Dales—a time jump since the utterly heartwarming Season 5 finale when Mrs. Hall learned that her son, Edward, was alive after the sinking of the HMS Repulse.

A violent psychiatric patient is on the loose, leaving behind a murder, a mystery and a body. In a case centered around the fledgling world of psychiatry, a violent psychiatric patient is on the loose ...