When June Knight, fourteen years old and the TV spokeskid for Yummy Nibbles, "the dog food dogs love more than people love people food," decides that she wants to break into the movies, her agent Morty comes up with a scheme to get her some national publicity: June pretends to sue her parents for emancipation and moves into the attic of a nearby boarding house, where neighborhood vandals have altered the "ROOM TO LET" sign out front to read "ROOMY TOILET."

When things begin mysteriously disappearing from the other tenants' rooms, newcomer June is the obvious suspect, and to prove her innocence, she decides to take on the most important role of her career and play sleuth. Each of the Roomy Toilet's wacky residents turns out to have secrets to conceal, and the book builds to a conclusion filled with multiple surprises and happy endings for everyone-well, almost everyone....