The pirate crew of the Lady Luck lives by many rules, but chief among them is this: they do not allow men on board. That's a rule that quartermaster Grace Porter is willing to break when a shipwrecked young nobleman offers her information of an omniscient map, stolen from his warship by an enemy vessel. Until now, the map was only the stuff of legend... but with its help, Grace may finally be able to hunt down the Mordgris, the sea monsters who stole her mother away from her. Unfortunately, some members of her crew have other plans... To find the map and face the Mordgris, Grace will have to confront her past, put the Luck between warring nations, and uncover treachery aboard the ship. And ultimately, her revenge and the destruction of the Mordgris will come at a hefty price: the betrayal of her crew. Grace promised them they wouldn't regret this. She just isn't sure that she won't.