Some people can afford to take it easy, but not Mia! She just graduated from college, but before she can celebrate, her adventurer brother Jack disappears while on another quest to solve the riddles of an ancient civilization! Now Mia must accompany their uncle, himself a renowned archaeologist and inspiration to the vanished Jack, on a round-the-world sailing trip to find her impetuous brother. Jack's trail will take our heroes across five continents and over and under the Atlantic to face dangerous trials and solve cunning puzzles. If they stay the course, their journey will lead them to solving the greatest mystery on Earth!