As the newest hire at the Endless Library, Bells Mortevue finally has access to magic again and a chance to prove that the daughter of criminal necromancers can be trusted with power-even if it's solely used to seek and sort books upon infinite shelves. Except a certain monster hunter refuses to let Bells do her job. Rhett Waltham doesn't want help. Not when revealing the truth of his research would be a death sentence for his ailing human father. Preparing to risk his own life in a dangerous competition to save his dad, Rhett does not have time for a curious, tantalizing librarian witch who asks too many questions. It's clear the Library disagrees, as the sentient space itself forces the two together. Bells warms to the grumpy hunter as she slowly earns his trust, though she starts to suspect a sickness is stirring within the walls of the mystical dimension. And when a deadly magic threatens to consume the entire Library-and the monster hunter's librarian-Rhett won't let either of them go without a fight.