Stonemason Andrew Knightley is pushed under a London Underground train during the morning rush hour. DI Max Arnold and his partner, DS Priya Shamsie, together build a picture of a lonely, devout, and troubled man who believed a spirit was leaving him vengeful Biblical messages. But the killer is flesh and blood, and a more earthly explanation may be found in the truth of Knightley's life.

This case follows the disappearance of a social media sensation who is married to the owner of an upmarket Chelsea eatery. Soon the investigation turns into a murder investigation and Max finds himself embroiled in explosive family politics.

A popular security guard is stabbed to death on a patch of waste ground. He leaves behind his terminally ill wife and at first, it appears he died as a result of a drug deal gone wrong. However, as Max and Priya soon realize, nothing is as it seems.

A teacher in a prestigious international school is murdered at home shortly before he's due to move to Japan. Although the teacher is said to have been well-liked, it seems there’s no shortage of suspects in his murder.

When an art gallery manager is strangled during the robbery of an exhibition, it appears he was in the wrong place at the wrong time. But as the team delve into the elite world of Chelsea's art scene, Max soon wonders if the victim was an accomplice.

A woman at a luxury retirement home dies mysteriously, and with no signs of forced entry, suspicion falls on the staff and residents; tensions within her family point to another cause, harking back to their time in Apartheid-era South Africa.

The most likely culprit in the murder of a psychotherapist is an ex-patient with a history of erratic behaviour; as the team digs into the therapist's personal life, they uncover disturbing revelations that cast a new light on his killing.

Jack Felton, the owner of a fruit and vegetable delivery company, is found stabbed at home in what looks like a frenzied attack; the detectives must unravel romantic jealousies, family conflicts and business rivalries to nab the killer.