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After weeks of searching the New York City catacombs for a centuries-old diamond buried by a pirate, George van Gelder and friends are stopped in their tracks when their underground enemy, Leroy, kidnaps George's father's new girlfriend and holds her for ransom in order to gain the treasure.

Joe Lumby is determined to find the mysterious treasure, "Margaret Rose, " after his kid sister is kidnapped.

Callie and Nick embark on a dangerous adventure after their archaeologist parents are kidnapped on a Greek island, and they battle deadly tombs, a lion-headed monster, and the schemes of a psychotic millionaire while trying to obtain a Mycenaean treasure that could cover their parents' ransom.

Teen pirate princess Alosa has delivered the final treasure map fragment to her father, pirate king Kalligan, when she discovers she is not exempt from his treachery.

"Traveling home by cruise ship should be a relaxing break after Emily's latest adventure, but things take a turn when the ship is overtaken by a pirate king and his crew.

When their ship, the Lost, explodes, Bick, Beck, Tommy, and Storm are stranded on a raft in the middle of the Mediterranean Sea, but the situation worsens when the treasure hunters kidnap their parents, forcing the Kidd siblings to follow clues around the globe to uncover an ancient treasure and save their family.