TAMSYN, GET HELP. The message appears on Tamsyn's computer screen. It's signed ZMASTER, the online name of a mystery kid. Tamsyn doesn't know if she should take the cry for help seriously, but she and her friend Josh soon start to think something is definitely wrong. Can they find out who ZMASTER is in time to help? Electronic messages flash around the globe as friends thousands of miles apart try to find a boy in terrible danger..