Beth and Cat head to a luxury spa run by Dr Angela Isherwood, who unexpectedly announces her retirement, names her successor, and then that night is murdered. Matilda's initial suspects are the disgruntled staff, but the guests also harbor secrets, and Cat is intrigued by rumors that Dr Isherwood won the money for the spa through gambling. Meanwhile, Dr. Lynch has news that upsets Matilda.

Matilda now has two murders to solve, made more complicated by the fact that one of the victims was using a fake identity. Matilda and Dr. Lynch devise a clever strategy to discover the victim's real name, while Beth and Jane find evidence of blackmail in Dr. Isherwood's office. Cat returns with a lead from the casinos, and Matilda eventually uncovers a tragedy waiting to be avenged.

Aunt Cat's art exhibit at Wildemarsh's trendiest new gallery is marred when Fintan Boyle, the ex-husband of the gallery owner, is discovered dead on star artist Keith Kane's installation. Kane is the prime suspect, but plenty of people had motives to kill Boyle. When one of the suspects beats a hasty retreat, it's unclear if he fled or was abducted.

A violent message hidden within an artwork suggests Cox isn't the only one with something to hide. Matilda finds evidence of a destroyed forgery, and Jane puts her computer skills to work uncovering more shady dealings within the world of modern art. Meanwhile, Kane has fallen of the rails, and his assistant worries for his safety. Could he be another victim of the killer?

Matilda investigates what appears to be a robbery with clues reminiscent of her own mother’s disappearance — and then Aunt Jane finds a body and the case becomes a murder. But as Matilda searches for the identity of the killer, there are other parties, much closer to home, who’d prefer Matilda not to disturb too many secrets.