Silly Milly and Jerry Giraffe go to the park to visit their friend Billy and Mama Cat Sue. A gust of wind blows Billy's hat off his head and the adventure begins. They meet up with Mousie Mouse and a polka dot rat. This is the fourth book in the Jerry Giraffe Series but they can be read in any order. This book is also available as a three-volume set featuring books 4, 5, & 6 under the title: "Jerry Giraffe and the Runaway Hat and Two Other Adventures."