Raised by stepparents after the loss of their birth parents, Liz and Meredith McCallister are the only constants in each other's lives - until Meredith is murdered in her lake home. Devastated by the loss, Liz becomes desperate to know why Meredith was killed. But the more she digs into her sister's past, the uglier the story gets. As Liz uncovers the truth, she realises that not all secrets were meant to come to light, and her efforts have drawn the attention of someone who is determined to keep the past hidden - even if the cost is Liz's life.