The first event in Death Valley Series 1 begins with retired actor John Chapel living a reclusive life in a picturesque Welsh town. Detective Sergeant Janie Mallowan, an ambitious young cop, is investigating the apparent suicide of Carwyn Rees, a local property developer. Janie is a fan of John's old TV detective show Caesar and is surprised to discover he lives next door to the victim. When John claims Carwyn's death was actually murder, Janie is skeptical but intrigued. Forensics soon confirm John's theory, prompting Janie to invite him to assist with the investigation.

Next, John and Janie begin working together on the Carwyn Rees case. They uncover that Carwyn's death was staged to look like a suicide and that evidence was planted to implicate his business partner in fraud. John uses his actor's insight and knowledge of crime fiction to help piece together the real story behind Carwyn's murder. Janie, initially reluctant, starts to appreciate John's unconventional methods and they form an uneasy partnership.

In the second episode, Janie investigates the death of a mysterious woman found on a mountain trail. To get closer to the case, Janie convinces John to join her mother Yvonne's walking group, which the victim was part of. John's presence in the group helps them gather information about the victim's identity and circumstances leading to her death. Their investigation reveals hidden tensions and secrets within the walking group, deepening the mystery.

The third episode focuses on the death of a best man at a wedding. Janie and John disagree on how to approach the investigation. John decides to go against Janie's wishes and befriends the bride to gain insight into the wedding party dynamics. Through this, John uncovers motives and relationships that Janie had overlooked. Their differing investigative styles cause friction but ultimately lead to progress in solving the case.

In episode four, John and Janie investigate a murder within an amateur dramatics group. To better understand the group and the victim, John takes a role in their next stage production. This immersion allows him to observe interactions and uncover clues that point to the murderer. Janie supports John's unorthodox approach despite some skepticism. The case reveals jealousy and rivalry among the actors, culminating in the identification of the killer.

Episode five begins with a murder-mystery party turning into a real investigation when a famous actor is found stabbed to death. John reconnects with an old flame during the investigation, which adds personal complexity to the case. John and Janie work through the party guests' alibis and motives, uncovering hidden resentments and secrets. The investigation reveals that the murder was premeditated and linked to the victim's past actions.

The final episode of the series involves a murder at a school reunion. John and Janie unravel a complex mystery that ties the current murder to a cold case from Janie's past. During the investigation, Janie discovers shocking truths about her own history, which affect her emotionally and professionally. John delivers unexpected news that risks their friendship but also helps bring the case to a resolution. The series ends with the murder solved and the partnership between John and Janie solidified.

Throughout the series, the narrative unfolds in a strict chronological order, with each episode focusing on a new murder case that John and Janie investigate together. Their partnership develops from initial skepticism and reluctance to mutual respect and collaboration, driven by John's theatrical insight and Janie's police expertise. Each case involves detailed step-by-step investigations, including gathering evidence, interviewing suspects, and confronting killers, with John often using his acting skills to gain access or information. The series balances crime-solving with character development and interpersonal dynamics, culminating in a final episode that ties personal backstory to the central mystery.

At the end of Death Valley Series 1 (2025), Detective Sergeant Janie Mallowan and retired actor John Chapel solve the final murder case involving Dean and a backpacker. Janie reveals that Rhiannon, not Rhys or Sian, was the true killer. Rhiannon had hit the backpacker with a car and then killed Dean to cover it up. Janie arrests Rhiannon, and John and Janie reach an important milestone in their relationship.

The ending unfolds as follows:

The final episode opens with a scream as Amber learns that Dean is dead. Helen Baxter informs DS Janie Mallowan about the situation. Janie gathers all the suspects to piece together the truth behind Dean's murder and the backpacker's death.

Janie recounts that Rhiannon snuck out the night of the reunion. Rhys was asleep but was alerted when his car was moving. He saw the car heading back to the reunion and rode his moped to confront Dean, mistakenly believing Dean and Rhiannon were having an affair.

Janie produces Rhys's shoes, which have traces of Dean's blood. Rhys admits to murder, but Janie senses something is off. John Chapel instructs Janie to close her eyes and focus. Janie then reveals that Rhys actually witnessed Rhiannon striking Dean with a spanner because Dean knew the truth about the hit-and-run accident involving the backpacker. It was Rhiannon, not Sian, who had driven the car that hit the backpacker. Rhiannon then killed Dean to silence him.

Janie explains that the blood on Rhys's shoes was planted by Rhiannon, who wore them because she has the same shoe size. Janie arrests Rhiannon, bringing the case to a close.

Meanwhile, John Chapel and Janie Mallowan reach a significant milestone in their fledgling relationship, marking a bittersweet but hopeful ending to the series.

Regarding the fate of the main characters involved in the finale:

• Janie Mallowan: Successfully solves the case and arrests the true killer, Rhiannon. She also deepens her relationship with John Chapel.

• John Chapel: Assists Janie in solving the case and reveals a big secret during the investigation. He shares a closer bond with Janie by the end.

• Rhiannon: Revealed as the murderer of Dean and the backpacker's hit-and-run driver. She is arrested by Janie.

• Rhys: Initially suspected and confesses under pressure but is ultimately cleared of murder.

• Dean: Victim of murder by Rhiannon.

The series closes with the resolution of the central mystery and the personal growth of the main characters, particularly the partnership and relationship between John and Janie.

For the TV show titled Death Valley, season 1 ("Series 1"), produced in 2025, there is no available information indicating the presence of a post-credit scene in any episode. The detailed episode summaries, reviews, and series descriptions do not mention or describe any post-credit scenes or additional content after the credits.

The show is a British mystery series focused on weekly murder investigations, featuring a retired actor John Chapel and detective sergeant Janie Mallowan working together. Reviews and episode guides emphasize the main storylines and character dynamics but do not reference any post-credit material.

Therefore, based on the current available sources, Death Valley (2025) does not have a post-credit scene.

The TV show "Death Valley," Season 1 ("Series 1"), produced in 2025, is family friendly with content suitable for children and sensitive viewers. It contains no sex, nudity, profanity, alcohol, drugs, smoking, or frightening scenes. The only potentially objectionable aspect is mild violence and gore, but nothing intense or disturbing. The tone is described as light, easygoing, and slightly silly, similar to Sunday teatime mystery shows like "Father Brown," making it appropriate for family viewing.