Retired actor John Chapel, known for playing the television detective Caesar, meets Detective Sergeant Janie Mallowan and insists that the death of property developer Carwyn Rees was murder, not suicide. His observations, based on his experience playing a detective, lead to the medical examiner confirming the murder. John Chapel then teams up with Janie to find the actual culprit.

The episode mixes comedy with the whodunit genre, featuring quirky lead characters with sharp intellects. The first ten minutes lean more towards comedy despite the serious murder investigation, creating a lightweight and somewhat comedic tone within the crime drama framework.

The police initially believe Carwyn Rees's death by gunshot to the head is a suicide. However, after John Chapel's input and further investigation, the medical examiner confirms it was murder, prompting a deeper inquiry.

Detective Sergeant Janie Mallowan is portrayed as a determined investigator who reluctantly teams up with John Chapel, the retired actor turned amateur sleuth. Their partnership is central to the episode, combining Janie's police work with John's detective insights.

The show is set in Wales and incorporates local references, though some viewers note the Welsh setting is underutilized. Thematically, it blends elements of cozy crime with comedy and a whodunit mystery, featuring a mix of lighthearted moments and investigative drama.