Thorn is a member of the Pilot's Guild--those who possess the magical ability to navigate Crosspointe's deadly seas. When a malevolent master within the Guild bans him from the sea, it seems his life is over. Then he is kidnapped and forced to serve aboard the rogue ship Eidolon--pitch black from bow to stern--and Thorn finds himself battling a mad captain, a mutinous crew, and the terrifying magic of the sea.

But there is a saboteur on board, trying to make sure the Eidolon never arrives safely in port. Thorn begins to realize his kidnapping may have been no mere chance--and that the cargo the black ship carries may seal his doom....