Seeking a quiet retreat in Kerala, India, British executive Andrew King (Nicholas Iron) takes his wheelchair-bound wife Lili (Tamzin Outhwaite) on a luxury houseboat vacation through the serene backwaters. To assist with Lili's intensive medical care, they hire Laya (Meera), a local nurse. Isolated on the water, tension builds as Andrew, frustrated by his wife's condition and emotional distance, develops an intense physical attraction to Laya. The two initiate a secret extramarital affair behind Lili's back. However, as Lili suddenly disappears and suspicions of murder arise, the idyllic setting turns into a web of deceit, blackmail, and unexpected betrayals where no one's true identity is what it seems.