Two perfect families. Two beautiful homes. A one-way trip to hell.

When two families organise a house swap, it seems like the perfect holiday arrangement.

The Browns will exchange their London townhouse for a stunning chateau in the south of France, the perfect place to relax and rekindle their flagging marriage.

And the Lesters are looking forward to showing their son, Rafael, around their old haunts in the British capital.

Sounds wonderful. Except for one thing – both families are hiding dark secrets, and secrets have a way of coming out…

In France, there’s a mysterious break-in at the chateau. Then the Browns discover that a woman who lived there disappeared and was never seen again. Instead of feeling rested and relaxed, they now feel isolated and vulnerable.

Then, in London, 17-year-old Rafael vanishes without a trace.

As the tension mounts to an unbearable pitch, both couples are forced to face their darkest demons. Someone won’t be coming home…