When Rob decides the family needs to get away for the summer Jess is not convinced - won't all the things they're escaping be waiting for them on their return? But the kids are thrilled, and before long their idyllic little cottage, the sea air, and the feel of skin sticky from sun-cream, lollies and sand, begins to work its magic.

As the summer heat intensifies and new friendships take hold, all is not as it seems. The water may look inviting but even the gentlest looking waves can hide the deadliest undercurrents.

Holidays, they're so often not quite as we hope . . . but this one is beyond anything Jess could have imagined.