Curse of the Ancient Emerald

<b>Frank and Joe must take the shine off a jewel thief who sends ominous riddles in this Hardy Boys adventure.</b> <p/>First a priceless painting disappears from the museum; then two ancient samurai swords vanish from a private collection. A string of robberies has hit Bayport and all signs point to the Phantom a recently released ex-con who last struck more than twenty years ago. There's only one problem: the Phantom has vanished into thin air and not even Frank and Joe Hardy can track him down. <p/>Then the boys begin receiving threatening notes in the mail each one containing a strange riddle. And it looks like the Phantom's next target could be the valuable Emerald of Astara the 2500-year-old crown jewel of the Bayport Historical Museum. Can the Hardys crack the Phantom's code before he strikes again?