When Alex, Mattie, and Sophie spy the giant vine sprouting in their garden, they know their next adventure will be different from any they've had before. Sophie's sure they've climbed into the pages of Jack and the Beanstalk. But when they reach the castle in the sky, nothing is as it seems. Will the Time Spies figure out their mission in this mixed-up fairy tale before a fee-fi-fo-fum chases them away?