Phineas, Ferb, Isabella, and Emily go on a buisness trip. When Mr. Biz overhears Phineas talking about a surprise when they get home, he thinks it's blueprints for a new invention. He and Buck volunteer to watch the kids while the parents are gone. They must find the blueprints all the while keeping the kids occupied. This article is a . You can help My English Wiki by expanding it.