Download or read book Hardy Boys 36: The Secret of Pirates' Hill written by Franklin W. Dixon and published by Penguin. This book was released on 1957-01-01 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a series of hair-raising adventures both on land and undersea the teenage brother detectives pit their wits against some of the most ruthless criminals they have ever encountered. It all starts when Frank and Joe are skin diving just for fun and the thrill of exploring the undersea world. Suddenly, deep in the waters that flow near the foot of Pirates’ Hill, a mysterious skin diver fires a spear through Frank’s air hose. From this moment on, danger is never far away. The very lives of the boys are at stake as they, along with the help of their pals, uncover a mystery involving an old Spanish cannon and a fabulous sunken treasure.