Puzzle-crazy, twelve-year-old Winston and his ten-year-old sister Katie find themselves involved in a dangerous mystery involving a hidden ring. Puzzles for the reader to solve are included throughout the text.

Claudia Dalton's father has disappeared. What began as a late night at work has spiraled into a missing persons case-one that's left twelve-year-old Claudia questioning everything she's ever known about her father and their family. But when she finally gets word from her dad, it turns out he isn't missing at all. He's just gone to "think things over" and visit an old friend, whatever that means. Feeling confused and helpless, Claudia starts to assemble...