Uncover the Secret of the Soldier’s Gold with Frank and Joe Hardy! 9780689858857 by Franklin W. Dixon. Hired by Portuguese police, the Hardy Boys stumble upon a WWII treasure hunt. A German soldier’s hidden gold bars await, but rivals seek the fortune. Will the boys find the loot and fulfill Mrs. Rilke’s charitable wish or will the gold fall into the wrong hands? Dive into this thrilling mystery!