A secret teacher party is happening in the library, but who is the party for? Harry and Doug plan to find out, but when they discover Harry's pet cat, Googer, skulking around their classroom, they have to catch him before anyone else does! They chase The Goog all over school, even into places students (and cats) aren't allowed. Will the boys capture The Goog without being caught themselves? Or will Harry's cat get him into the most horrible trouble ever?