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.