In the seventh book, Zoey and Sassafras are excited to enjoy their summer with their magical friends. But . . . why is everyone so grumpy? A bunch of bad days one after the other lead Zoey to suspect that something more is afoot. It's up to Zoey and Sassafras to solve the mystery before they end up with one bummer of a summer!

Not all of the wizards who were freed from Maldred's time-trap were good wizards; one of them, Astrid, is planning on working a spell that will bring to life the bones that lie scattered in the Fortress of the Stone Dragon, bones that belonged to creatures much bigger than dragons--and when his friends are turned to stone it is up to Drake to find a way to save them, including his own dragon, Worm.

Secret agent Bubble07, who exactly resembles a stuffed toy, is on Earth to assess whether or not the unicorns should invade the planet--but despite some bizarre Earth customs like show-and-tell, and annoying Earth dogs, ultimately suggests that Earth would serve as an excellent vacation destination for unicorns.