This book collection is a must-have for young readers who enjoy mystery and adventure stories. The set includes four complete books, all of which are in their original edition. The hardcover binding and dust jacket make for a great addition to any collector's library.

The stories in this collection are written by renowned authors including Noel Sainsbury Jr., Roy Rockwood, Willard F. Baker, and others. The topics covered in these books are mystery and thriller, perfect for children who love to solve puzzles and embark on exciting journeys. This antique collection is a rare find and a great addition to any book lover's collection.