The Sparticle Mystery
An experiment gone wrong causes everyone over the age of 15 to disappear from planet Earth.

While the team are on their way to the Sparticle Project, Ami is captured in the woods by the Water Rats - a group who love life messing around on the river. The Water Rats are at war with the Menaces - and the Questers, persuaded by Ami, decide to help. Will Ami swap the seriousness of the Quest for a kid's life of fun and games? Jeffrey is keen to help out more, but his wheelchair needs more power. Tia and Jeffrey discover a satellite communication system which allows them to send a message into the ether, asking anyone out there for the batteries Jeffrey needs. They arrive back at the hotel to a package - it's from Anita at the university and it comes with a message.