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The hit series returns as South Wales police call in forensic officers and major crime detectives when they find the frozen body of an elderly lady in a chest freezer after searching the home she shared with her son, Christopher Phillips. The detectives must determine whether Christopher murdered his mother and placed her in the freezer.

In Porthcawl, South Wales, the frozen body of an elderly woman has been discovered in a large family chest freezer. Detectives have arrested her son and begin an investigation to discover whether she died of natural causes - or if she was murdered. As they delve into his bank accounts, a financial motive begins to appear that might suggest he had a clear reason to keep her in the freezer.