The second book in the series, The Unbelievable Oliver and the Sawed-in-Half Dads can be enjoyed by itself and provides a small amount of background knowledge for those new to the series. Cartoon gray and yellow illustrations appear on almost every page, making this book suitable for children who are just graduating to chapter books. The setting contributes to the mystery vibe, as the children navigate a mansion with hidden rooms and a garden maze while solving the mystery of the missing father before the wedding, which takes place on Halloween. The straightforward writing ticks along, including lots of dialog and simple descriptions that will appeal to young readers. The humor is often silly and sometimes slapstick. All of the frights are mildly scary, and the kidnapper was introduced earlier in the story, making this an age-appropriate mystery. Oliver’s talking rabbit adds another fun element to the text. This book will find wide readership in grades 2-4.