Six-year-old Ivy Reed is abandoned in a New Orleans cemetery because she can understand animals. Guided by animals, she reaches the Midnight Clinic, run by former vampire enforcer Adrian Blackwood and wheelchair-bound doctor Lucien Vale, lovers for two hundred years. Ivy’s gift helps the clinic find licensed blood, rescue missing Council heir Julian Devereaux, and give Lucien a chance at ancient-blood treatment. As pureblood Vivienne Frost spreads rumors and Lucien’s creator Cassian Vale invokes an obsolete blood tithe, the family and their animal allies rebuild an abandoned canal quarantine ward into a rescue center, producing synthetic blood and Vesper lichen suppressants. After the masquerade blood-frenzy crisis, the Council offers power in exchange for Ivy’s custody; Adrian and Lucien refuse. In the end, Ivy learns she is neither bait nor monster and does not have to be useful to belong.