When their cousin Salim vanishes from a sealed pod on the London Eye ferris wheel, it seems like an impossible mystery. Ted, who has Asperger's syndrome, and his sister Kat must use their unique perspectives to solve the case. Ted's logical, detail-oriented mind notices clues everyone else misses, while Kat's determination pushes the investigation forward. Together, they race against time through London's landmarks to find what happened to Salim before it's too late.