Seasparrow

"Hava sails across the sea toward Monsea with her sister, the royal entourage, and the world's only copies of the formulas for the zilfium weapon she saved at the end of WINTERKEEP. During the crossing, Hava makes an unexpected discovery about one of the ship's crew, but before she can unravel the mystery, storms drive their ship off course, wrecking them in the ice far north of the Royal Continent. The survivors must endure a harrowing trek acro...