July, 1976 – Thames Valley, UK. Long, scorching days of blue skies, water shortages, and record temperatures. A newly promoted Detective-Sergeant is tasked with investigating the murder of a local shop owner – an investigation that goes tragically wrong...

Fast-forward forty-five years to 2021, when a chance discovery exposes a grim secret that forces a reexamination of the circumstances surrounding the ill-fated murder inquiry.

DCI Brendan Moran is assigned this coldest of cases, and it soon becomes apparent that he is dealing with a cold and calculating criminal mind. Can Moran and his team piece together the events of that long forgotten summer and unmask the killer before history repeats itself?