A giant hurricane unexpectedly hits the tri-state area. Whats worse, Phineas, Ferb and Candace are home alone while Linda and Lawrence are on an overseas trip! Whats a pair of boy geniuses and their teenage sister to do? For that matter, where's Perry?

School's out for summer, but both Billy and Mandy's parents plan to send them away to a summer camp in the middle of the Rocky Mountains! Camp Clearview will never be the same. Some light implied Billy x Mandy in later chapters.