Sigfried’s Smelly Socks!, written and illustrated by Len Foley, is a picture book for young readers, ages three to seven-years-old. The story is about a young boy who is trying to find out why his book smells so much. I would recommend this book for children who are at least five-years-old. Parents and children who enjoy toilet humor and overall silliness will enjoy this book. However, those who do not enjoy toilet humor avoid this book. The book is about a young boy, Sigfried, who explores various stains in his book to figure out why the book smells so bad. The mystery aspect of the book will pull young readers in as they try to help Sigfried get to the bottom of the smells. The author touches on all aspects of gross smells and their causes.