"Fitz and Cleo are in need of some excitement in their lives. How do they raise their spirits? With a party, of course! But what makes for the perfect celebration? Don't worry, the Party Squad is on the case! Don your silliest hat and get the confetti ready as our favorite pair of ghostly siblings (and Mister Boo!) discover the secrets to throwing the most epic shindig in their most festive adventures yet!"-- Provided by publisher.