Ben's been grieving for his best friend, Will, who suddenly disappeared from their tiny village a year ago. But when twins Sam and Jack begin at the school, things start to look up. Cool, good-looking and popular, they draw Ben into their world and introduce him to The Challenge. What first appears to be a fun internet game quickly turns sinister as Ben's tasks become wilder and more dangerous, starting to raise questions over Will's disappearance. But once you're involved with The Challenge, it's very hard to get out . . . .