One year ago, Sienna Vale disappeared. At 11:13 p.m., a dead school bell rings-and her phone sends a message.Seventeen-year-old Harper Lane has spent the past year trying not to think about the night her best friend vanished after Ashford High's winter formal.Then, on the anniversary of Sienna's disappearance, Harper is working alone in the school newspaper room when an emergency bell that hasn't worked in more than twenty years suddenly rings.Seconds later, a message arrives from Sienna's disconnected phone: YOU WERE SUPPOSED TO FIND ME.Attached is a photograph of Harper taken less than a minute earlier.Someone is inside the school.Someone is watching her.Harper's search for answers leads to hidden records, contradictory stories, a sealed stairwell, missing scholarship money, and the death of a student eight years earlier-a death everyone in Ashford was told was an accident.With her friend Olivia at her side and suspicion closing in around the people she trusts most, Harper begins to realize Sienna wasn't the first person to uncover Ashford High's secrets.She was simply the latest person someone needed to silence.Because some warnings aren't meant to save you. They're meant to make sure you stop looking.A dark, fast-paced YA mystery thriller about friendship, buried secrets, false suspects, and the dangerous difference between what everyone believes and what the evidence proves.