They'll fight the unseen evil, on the land or on the sea!

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During one of the earliest blockade actions of the Civil War, US Marine Sergeant Alexander Philips witnesses an unspeakable horror. With no explanation, he finds himself in charge of a group of hotheads and misfits in a strange, unorthodox unit. His new commander is the enigmatic Lieutenant Addison Green, who knows nothing about the military, but a great deal about something else entirely. He comes bearing a collection of weapons geared towards fighting something other than confederates.

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The marines of M Company take part in the Battle of Roanoke Island, doing a job far different than that of the other soldiers. They learn their true purpose-hunting the monsters that flood into the world in times of conflict. In the jungles of Roanoke, they find their first mission-to hunt the mysterious woman in white, a witch who commands the legions of hell and enchants the unsuspecting.

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Their journey takes them through Saint Augustine and behind enemy lines to New Orleans, where they find an even greater threat to the Union than they ever expected.

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