This vintage paperback book titled "Madcap Mystery" by Karin Anckarsvard is an interesting and captivating read for young adults aged 9-12 years. The novel is a fiction mystery with an intriguing plot that will keep the reader engaged until the end. The book was originally written in Swedish and has been translated into English.

It features beautiful illustrations by Paul Galdone that add to the overall reading experience. The book is in good condition for its age, published in 1962, and is perfect for collectors of vintage books. This paperback book is a great addition to any mystery genre lover's collection.