This book had a much lighter tone than "A Swift Pure Cry," which made for a more fun, lighthearted mystery. The main character is a teenage boy with Asperger's Syndrome. I wasn't sure how that was going to work at first - would he be interesting or just annoying? - but it worked out really well. He can connect dots that don't seem to form any pattern when when his cousin disappears on a trip to London. His older sister, Kat, helps, and the kids are able to figure out how their cousin was able to disappear from a sealed pod on the ride and where he was.I liked this book. It was a lot different from Ms. Dowd's first book, "A Swift Pure Cry," which was much more serious and emotional. If you're looking for a book that's a fun, fast read, "The London Eye Mystery" is a good fit. It's well written and engaging.