Raised by stepparents, Liz and Meredith McCallister are the only constants in each other's lives—until Meredith is murdered in her lake home. Devastated, Liz seeks clues in her sister's past, finding that as a teenager, Meredith gave up a child for adoption. When Liz meets her niece for the first time, she encounters an angry, troubled teenager. Liz discovers that their family had many buried secrets, and now she has drawn the attention of someone who is willing to kill to keep the past hidden.