Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather, and they are about to discover a mystery in a fortune cookie!   When the Aldens go to dinner at a local Chinese restaurant, Benny can't wait for his favorite part of the meal: dessert. He loves breaking open the delicious fortune cookies and reading the messages inside. But when Benny opens his cookie, he is in for a surprise. Instead of a fortune, Benny's cookie contains a handwritten riddle! One cookie leads to another, and the Aldens soon realize they've bitten into another mystery. Who is leaving the Aldens the mysterious cookie clues ... and why?