Halloween descends upon Cobalt City, and a legendary figure known only as Trepanning Mary stalks the leaf-blown avenues, spreading fear and chaos in her wake.

Even the detective skills of cycle-riding vigilante Gato Loco's might not be up to the task of catching this phantom who has somehow eluded capture for almost a century. Fearing a magical threat, Gato Loco enlists the help of undead jazz pianist and reluctant protector Mister Grey, putting them both at odds with the mysterious, haunted hero Tatterdemalion.

The cat. The dead man. The tattered woman.

Will they be enough to save Cobalt City from an evil centuries in the making?

Because Trepanning Mary has returned to the city. And hell is coming with her.