Will the Internet help save a life? 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..

Once they altered the features of the face on the computer screen, they knew they had their man. The photograph, flashed instantly from Australia via the Internet, sends Rob, Tamsyn, and Josh on a thrilling hunt for a man wanted by the police on two continents. Rob and Tamsyn have seen him once in person, but they've no idea where he is now. With the help of brilliant detective work by their friends on the Net, they start to track down their mysterious suspect...

A scrambled message comes over the Internet from a yachtsman out at sea. Josh, Rob, and Tamsyn are sure it contains a clue to the identity of an art thief. Now they must decipher the message and, with time running out, set a trap for a dangerous enemy.

Years ago, Josh Allen's father was blamed for a crime he didn't commit. Now Josh, Tamsyn Smith, and Rob Zanelli use their contacts on the Internet to try to prove Mr. Allen's innocence. The trail leads them around the world—but someone is always a step ahead of them. Then Josh himself is accused of a crime. He swears he's innocent. Is history repeating itself? And why?

A blackmail threat has been posted on the Net. Is it a hoax? Or will famous theme-park rides really start to become death traps? As they head off on their theme-park vacation, Josh, Tamsyn, and Rob hope it's a hoax. But a frightening incident proves it's not. With the help of their friends on the Net, they must find the unknown blackmailer—before someone gets killed....

Communicating on the Internet leads six teenagers - three in England and three on different continents - into exciting mysteries. How can new videos, music and computer games be offered for sale on the NET before they have even been released? And how does a famous TV star fit into the picture?

Communicating on the Internet leads six teenagers - three in England and three on different continents - into exciting and dangerous mysteries. The black widow computer virus is wreaking a trail of destruction on PCs across the globe, and at the centre of the web is Abbey School.

Communicating on the Internet leads six teenagers - three in England and three on different continents - into exciting and dangerous mysteries. A guided tour of a visiting US warship leads Josh, Rob and Tasmyn to a trail of bizarre and inexplicable incidents.