Unhappy at being sent to stay with his grandmother at the inn she operates, The Intergalactic Bed & Breakfast, Scrub discovers that each room is actually a portal to space and the inn's visitors are aliens who are vacationing on Earth.
When a pair of UFO-watchers disguised as aliens tries to get inside the Intergalactic Bed & Breakfast to broadcast their findings, it is up to David and Amy to keep the imposters at bay.
Spending another adventure-filled summer in the Pacific Northwest at his grandmother's hotel for visiting space aliens, eighth-grader David uncovers a plot to destroy the Earth.