Everyone at Coal Hill School has become obsessed with completing exciting dares posted on a strange new website run by the charismatic vlogger Seraphin. Soon the challenges become more dangerous and competitive, yet even broken arms and fistfights don't stop the craze for them. And then students start to disappear. As April's fragile group of friends starts to fracture, she decides she's going to uncover the truth behind this site herself. Whatever it takes, whomever she hurts, April's going to win. But then, to her horror, she wakes up and finds her whole world is changed.