From back of book: Thorn is a member of the Pilots' Guild, a group composed of those rare, brave souls who possess the magical ability to navigate Crosspointe's deadly seas. But his reason for living is ripped away when a malevolent master within the Guild betrays him and bans him from sailing. Then Thorn is kidnapped and forced to serve aboard a ship--unregistered, unmarked, and pitch-black form bow to stern.

The Eidolon is a cursed vessel, and Thorn finds himself battling a mad captain, a mutinous crew, and the terrifying magic of the sea. And soon a series of strange accidents suggests that there is a saboteur aboard, trying to make sure the Eidolon never arrives safely in port. Thorn begins to realize that his kidnapping may have been no mere chance--and that the cargo the black ship carries may seal his doom.

(Source: Roc)