Four families gather for a dream luxury holiday but a dark secret triggers fears of betrayal and ends in murder.It was supposed to be the perfect holiday - a group of families enjoying a week together in the sun. Four women who have been best friends for as long as they can remember making the most of a luxurious villa in the south of France.But on the day they arrive, Kate uncovers a secret: her husband is having an affair. The dream holiday quickly becomes a nightmare when she suspects the other woman is one of her best friends, working against Kate to destroy her family. But which one is it?As Kate closes in on the truth in the stifling Mediterranean heat, she realises too late that the stakes are far higher than she ever imagined...Because someone in the villa may be prepared to kill to keep their secret hidden.Jill Halfpenny (The Drowning, Liar) and Owen McDonnell (Killing Eve, The Bay) lead the cast.Based on The Sunday Times' Top Ten Bestseller