Best friends make the deadliest enemies.

Jane Whitaker and Ivy Chapman have been best friends for twenty years - ever since their sons Cal and Brad attended the same preschool.

But their close bond is severely tested when their now adult sons go skiing together in Wyoming and only one returns.

Where is Cal Whitaker and why didn’t Brad Chapman report him missing? With growing fears for Cal's safety, his family begins to suspect Brad knows a lot more than he's saying.

Friendship turns to suspicion and then to open hostility when Cal's sister Emerson posts an online appeal that ignites a vicious crusade against Brad.

As decades-old loyalties crumble, Jane and Ivy find themselves on opposite sides of a deadly divide. How far will each mother go to protect her family? And what happens when saving one son means destroying the other?

You Shouldn’t Have Done That – the gripping psychological thriller perfect for fans of Lisa Jewell, Liane Moriarty, and Sally Hepworth.