Frank and Joe must take the shine off a jewel thief who sends ominous riddles in this Hardy Boys adventure.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 u201cthe Phantom,u201d a recently released ex-con who last struck more than twenty years ago. Thereu2019s only one problem: the Phantom has vanished into thin air, and not even Frank and Joe Hardy can track him down.Then the boys begin receiving threatening notes in the mail, each one containing a strange riddle. And it looks like the Phantomu2019s next target could be the valuable Emerald of Astara, the 2,500-year-old crown jewel of the Bayport Historical Museum. Can the Hardys crack the Phantomu2019s code before he strikes again?_x000D_ Download and start listening now!