The arrival of a secret sibling tears a family apart. But is she who she claims to be?

Wealthy business tycoon Nathaniel Carson dies, leaving behind a vast fortune to his family. The Carsons host a dinner to celebrate what would have been his 79th birthday – only to have an unexpected guest arrive.

Mia claims to be Nathaniel's youngest child, the product of an affair. Unassuming, likeable and seemingly desperate to connect with the family she did not know existed until a few weeks ago, Cassie Carson welcomes her with open arms. But not everyone is quite so accepting of the new addition.

When a series of concerning coincidences emerge and a family member is killed in suspicious circumstances, even Cassie begins to doubt her new sister.

The more Cassie unearths, the more terrified she becomes. Who really is Mia? And what lengths will she go to in order to get her hands on the family fortune?

A tense psychological thriller full of twists and turns. Perfect for fans of Gillian McAllister and Lisa Jewell.