DS Janie Mallowan teams up with eccentric national treasure and beloved TV detective John Chapel, to solve a murder.

After a mysterious walker is found dead on a Welsh mountain trail, Janie ropes John into joining her mam Yvonne’s walking group to investigate the unidentified woman.

Janie and John disagree on how to investigate the untimely death of a best man. John goes against Janie’s wishes and befriends the bride to gain insight into the wedding party.

John and Janie investigate a murder in an amateur dramatics group, prompting John to take a role in their next stage production.

A murder-mystery party turns into a real investigation when a famous actor is found stabbed to death. John reconnects with an old flame while he and Janie investigate.

John and Janie unravel a mystery involving a murder at a school reunion, a cold case, and a shocking discovery from Janie’s past. John risks their friendship with unexpected news.