It only takes an instant for Grim—monster hunter and emotionally scarred hero—to lose everything. Grim is having a bad year. A hunter by trade, his world is ripped apart when he is cursed with a sickness that is slowly changing him into one of the very creatures he hunts. Worse, Grim is forced to abandon the woman he loves for fear that he’ll destroy her. So he must find a cure. Otherwise, they’ll never be together. Yet there’s hope in a thorny alliance with an eccentric billionaire who lives in a castle. But the billionaire has his own problems. He’s being hunted by an elusive monster, one that wants him dead. So, he strikes a deal with Grim—capture the creature and Grim will be healed. Now Grim must navigate a castle filled with creeping shadows and portraits that seem to stare at him, a suspicious butler, and the billionaire's young daughter. She may hold the key to unlocking the truth behind why the creature is hunting her father—if only she could remember the past. Can Grim stop the monster, break the curse plaguing him, and be reunited with the woman he loves? Or will he succumb to the darkness growing inside of him?

It only takes an instant for Grim—monster hunter and emotionally scarred hero—to lose everything. Grim is having a bad year. A monster hunter by trade, his world is ripped apart when he's cursed with a sickness that's slowly changing him into one of the very creatures he hunts. Yet there's hope in a truce with his sister, Shelby. If anyone can help, it's her, because she's the strongest witch he knows. But unfortunately, Shelby hates him. She begrudgingly agrees to help, but Grim has to assist her first. You see, her old coven seeks the bones of a dead witch—magical bones that are supposedly hidden in her house. All Grim has to do is find them to stop the coven from snatching them first. Now he must navigate a house with a mind of its own—a home that happily throws up obstacles in his path. He must also stop the coven from harming his sister—all while attempting to find a cure for himself. Can Grim find the bones and stop the coven, or will they get them first? And most importantly, will Grim find a cure for the sickness?

It’s all come down to this. Monster hunter Grim has been promised a cure for the disease that he’s infected with—a disease that will cause him to change into one of the very creatures that he hunts. That promise comes in the form of a television celebrity who has own agenda—record Grim’s healing process for his audience, an audience that gets to vote for Grim’s outcome every step of the way. Will Grim be healed? Or will he succumb to the disease?