Hardy Boys 12: Footprints Under the Window - by Franklin W Dixon (Hardcover)

The Hardy Boys: Footprints Under Windows is a thrilling adventure that follows the young detectives, Frank and Joe, as they uncover a top-secret instrument vital to the United States space program.

With their father's documents missing and mysterious footprints leading to a group of islands off the coast of South America, the Hardy Boys must use their skills and determination to solve the case.

Will they be able to recover the stolen instrument and uncover the identity of the diabolical mastermind behind the "Footprints" spy ring? Find out in this exciting installment of The Hardy Boys series!