When Cat has the chance to escape Cornwall and spend the summer on the French Riviera with some rich family friends, she jumps at the opportunity. There she meets a group of people who don't seem to have a care in the world. Henry is different though, more interesting; she falls for him, he falls for her. Yet Henry has secrets. Strange circumstances surround the death of his mum a few years earlier - and when he invites Cat to his eerie French countryside mansion for a few days, she thinks she could help him get to the bottom of things by doing some digging into past crimes. But not everyone wants the case to be investigated.