In this twisty psychological thriller from the #1 New York Times bestselling author of THE CELLAR, Ivy finds out that her twin sister, Iris, is trying to push her out of her own life--and might be responsible for their mother's death.After their parents divorced, 10-year-old twins Ivy and Iris were split up--Ivy lived with Dad, Iris with Mom. Now, after a tragic accident takes their mom's life, the twins are reunited and Iris moves in with Ivy and their dad. Devastated over M