- Ted and his sister Kat are not exactly friends. Ted has a "disorder" which causes his brain to operate on a different system than everyone else's. Their cousin Salim comes to visit them in London and wants to see the city, especially the giant wheel called the London Eye. A stranger offers the three kids a free ticket on the Eye. Since Salim is the guest, he gets the ticket. Ted and Kat watch as Salim goes up in the wheel, but when his capsule comes back down, Salim is gone. How is it possible for someone to vanish from a sealed capsule? Using his unusual brain and memory for details, Ted looks for clues others don't see. As Ted finds clues, Kat moves to action. Their only chance to find Salim is to work together as a team.