After Mrs. Halverson tricks Apartment 9 into hosting a 60th birthday party for Mr. Halverson, our four friends have just one question: who is Mr. Halverson? After all they've never met him before. With only hours to go, Bradley, Cameron, Allison, and Dylan must discover who Mr. Halverson is and pull out all the stops in order to throw the biggest birthday bash the Fairvale Building has ever seen.