The Curse of the Ancient Emerald (Hardy Boys Adventures Series #9)

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 "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.

T...