Mother Knows Best — Andrew E. Moczulski

Eric Margrave, monster hunter for hire, and his ghostly partner, Lydia, have faced some truly horrible things in their short partnership. Ghosts, mad werewolves, and berserk gods have fallen before them.

Then Eric's mother comes to visit, and it all falls apart.

Katya Margrave is not the world's best mother. But she may very well be the world's best sorceress. When someone with that kind of power asks for a favor, familial affection only earns you so much leeway. In short order, Eric finds himself dragged halfway across the planet on what may possibly be his least favorite case ever.

But on the bright side, whatever hideous monsters threaten his life? They will probably still be less scary than the one who used to change his diapers.