Reeling from the loss first of his best friend and then of his father, snobbish, arrogant twelve-year-old Phineas Cawell finds himself aboard a ship on the very sea that took them both away. Phineas' one goal in life is to become a "landed" gentleman, and to marry the exquisite Susannah Kilburn - lofty goals for a penniless twelve year old Bostonian in the year 1705. To his horror, he is taken to sea by his well-intentioned but rather daffy Uncle Neville. Phineas finds he must learn to make his way among the frightening, gruff sailors aboard the ship, must hold his own against desperate pirates, and look beyond the past to find the meanings of courage, friendship, and home. Patrick Caswell, Phineas' sea-captain father, has disappeared into the Caribbean, rumored to have turned pirate. The Spanish treasure ship Tres Hermanas has been taken by buccaneers. In her hold she carried a cargo that will change the map of Europe. Queen Anne of England has dispatched secret agents to recover the treasure. But what has become of the treasure? What happened to Patrick Caswell? Who are these agents? Only Red Suarez holds the key. But he's the vicious, self-appointed pirate king of Port Royal. Leave it to Phineas to bumble his way into a stunning adventure filled with naval battles, chases, and an amazing, all encompassing hurricane. The sailor's life has much to teach Phineas. Although he is a reluctant student, Phineas, Taylor the cabin boy, and the French princess Louise find themselves face-to-face with cruel buccaneers, and must learn the most difficult lesson of all in adventure as vast as the sea itself.