At the launch of her highly anticipated skincare product, a wellness business owner suddenly dies from an allergic reaction. But Mervin quickly deduces her death to be suspicious when, despite the presence of peanuts in her throat, the victim didn't eat or drink anything. Meanwhile, Darlene struggles to train up newbie officer Seb Rose as they investigate an obscure party drug that's doing the rounds on the island. And tensions run high as Selwyn battles devastating news, while Mervin begins to doubt his own instincts when he uncovers compelling evidence in his mother's case.

Mervin begrudgingly embraces island life and agrees to watch a local women's football game with the team. But half-time sees a bloody discovery when the star player is found dead in the locker rooms with a fatal bullet wound. The team are left perplexed when it becomes clear that the only way to access the changing rooms is via the pitch - and no-one in the crowd saw anything. So, how did the killer slip through the net? As Mervin feels the pressure from Selwyn over a murder that took place right under their noses, Naomi is at a crossroads when someone from her past turns up on the island.