In the midst of the 1971's cruel winter, the foundations of Endeavour and Thursday's relationship are profoundly shaken when Thursday unwittingly discovers the extent of Endeavour's problems are greater than anybody could have suspected.
Meanwhile things at home become quite tense for Thursday and Win when they receive disturbing news from abroad.
When a snowstorm splits CID, and they independently work to solve the murder of a college don, Thursday enlists the help of Dorothea, while Endeavour finds himself stranded at an abandoned hotel, a pawn in a game of gruesome revenge.
