Olivia Prior has grown up in Merilance School for Girls, and all she has of her past is her mother’s journal—which seems to unravel into madness. Then, a letter invites Olivia to come home to Gallant. Yet when Olivia arrives, no one is expecting her. But Olivia is not about to leave the first place that feels like home; it doesn’t matter if her cousin Matthew is hostile, or if she sees half-formed ghouls haunting the hallways.

Evie Von Rathe lives in Blight Harbor—the seventh-most haunted town in America—with her Aunt Desdemona, the local paranormal expert. Des doesn’t have many rules except one: Stay out of the abandoned slaughterhouse at the edge of town. But when her aunt disappears into the building, Evie goes searching for her.

Thirteen-year-old Molly doesn't know how she got the short end of the stick - being raised by her neglectful father - while Dustin, the older brother she's never met, got their mother and the keys to the family estate. But now the siblings are both orphaned, and if Dustin won't welcome her into the family business, then she'll happily take her half in cash. Except: The family business is a mortuary for monsters.

Essie O’Neill is afraid of everything. Most of all, she’s afraid of the red door in her nightmares. But soon Essie discovers so much more to fear. Her mother has remarried, and they must move from their dilapidated tenement in the Bronx to North Brother Island, a dreary place in the East River. That’s where Essie’s new stepfather runs a quarantine hospital for the incurable sick, including the infamous Typhoid Mary.

Tori, Marvin, and Noah would rather be anywhere else than on the seventh grade class field trip to Raven Island prison. Tori would rather be on the soccer field, but her bad grades have benched her until further notice; Marvin would rather be at the first day of a film festival with his best friend, Kevin; and Noah isn't looking forward to having to make small talk with his classmates at this new school. But when the three of them stumble upon a dead body in the woods, miss the last ferry back home, and then have to spend the night on Raven Island, they find that they need each other now more than ever.