When Ted’s cousin Salim visits London, he insists on riding “The London Eye,” an immense observation wheel. A stranger gives Salim a free ticket; Salim enters a passenger capsule; 30 minutes later, when the capsule returns from its rotation, Salim has vanished. What follows is an intricate mystery, related from the unique point of view of 12-year-old Ted, who has Asperger’s Syndrome. Ted is a brilliant but literal thinker who sees things in things in terms of mathematical probabilities. His brain, though differently wired, is as efficient as a computer. It is precisely the logical mind needed to solve the mystery, and it saves Salim’s life. This is a well-constructed puzzle, and mystery lovers will delight in connecting the clues, but what makes this a riveting read is Ted’s voice. He is bright, honest, brave and very funny about his “syndrome” (his teacher has given him a cartoon code for recognizing the five basic emotions). The message, grippingly delivered, is that kids, even differently abled ones, are worth paying attention to. (Fiction. 9-14)