The must-read suspense novel of the summer about a mysterious sister's disappearance, her biggest betrayal and a deadly truth screaming to come out. Grace and Maddy are sisters who have nothing in common—until they both disappear on a class trip. Days later, Grace is found, injured and disoriented, with no memory of what happened—and no clue where her sister is. Everyone thinks she’s lying. It’s hard not to look guilty with Maddy’s blood on her clothes. With nothing but Maddy's journal as her guide, Grace must piece together what happened to clear her name and find her sister. But she is about to discover that her own secrets could be the most terrifying of all.