- 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.
- On the eve of his eleventh birthday, Sam searches for hidden presents. In the attic of the building where he lives with his grandfather Mack, Sam finds a newspaper clipping instead. Sam doesn't read well, but he can read the word "missing," under a photo of a small boy. Sam is reminded of something. Was it a dream, or something that happened to him long ago? Suddenly Sam questions his whole life with Mack. Meanwhile, at school, Sam is paired with a girl named Caroline to build a model castle. She agrees to help Sam with his reading. As they put together the castle, they also put together the information they find about the missing boy, and more of Sam's own memories.