Daughter of Treasure

Leslie has sailed the seas with her father ever since her mother died, when she was a very young child. Her father's fame as the wealthiest pirate Captain, has spread farther than she knew. Though his wealth is great, the mates are still after the greatest prize they have gone after yet, The Great Jewel, which is said to be the most valuable treasure left to mankind.
But as they search an isolated island, their adventure takes a turn in the wrong way, when, Rage de Darken a treasure thirsty pirate, attacks her father's mates and makes it clear that he will not release the captain without a reward. 
Leslie sets off in search of this ransom. If she can bring her father's treasures back to Darken before the blue moon sets, then he will release her father to her. Only problem, she doesn't know where her father's treasure is hid. 
Can Leslie find her father's treasure in time to save his life? Or will Darken destroy the most dearest treasure Leslie has?