The secret warning Hardy boys Franklin Dixon book hardcover 17 fiction Strange events involve Frank and Joe Hardy in a mystery which shrouds an ancient treasure--the golden head of the Pharaoh Rhamaton IV. The owner of the million-dollar golden Pharaoh's head claims it was aboard the freighter Katawa , which sank not far from Whalebone Island. But suspicious developments indicate that Mehmet Zufar may be trying to defraud the shipping line's insurance company. Frank and Joe enthusiastically accept the challenge of their famous detective father to assist him in investigating the complex case for Transmarine Underwriters. Writing on second page see photo Buyer pays return shipping Shipping to Canada and the continental United States only