Geoffrey's going to write some letters, but can't find his pen. Zippy thinks he could be a good detective and George helps him look for the missing pen. They dress in different disguises and try to solve the case of the missing pen, starting by looking in the bedroom. Zippy and George want to borrow Geoffrey's magnifying glass to find the clues to solve the mystery of the missing pen. Zippy thinks Geoffrey took the pen so they look downstairs for it and they find it under the storybook. Geoffrey reads a story called 'Mr Snoozer's Parrot' Geoffrey's going to write his letters, but can't find his writing pad so it looks like another case for Detective Zippy, until Bungle finds it!