A cottage by the sea, owned by a local charity that lets it out to the public, is ravaged by a gas explosion. The burned corpse of a man is found inside and a badly burned woman is found outside, who dies in hospital before she's able to talk. When they are identified later, a web of betrayal, secrets and love affairs is revealed. The woman's husband, who was also the business partner of the dead man, is immediately suspected. But then he too is murdered...