Just a few months after the destruction of the bone mirror, the team of Lockwood & Co. has another big case to tackle: When Lucy gets a letter from her little sister, begging her to come back and help her with a haunting doomed to kill them, she doesn't need long to make a decision, and neither George nor Lockwood are going to let her face this alone. To not get any unwanted attention in her hometown, Lucy and Lockwood agree to take a closer look disguised as a couple while George is busy researching. But when the haunting turns out to run much deeper and wilder than any of them thought, and other players enter the game, one question arises: Will Lockwood & Co. also make it out of this case unscathed?

Eight months ago, Lucy walked away from Lockwood & Co.-from the danger, the ghosts, and, most of all, him. She told herself it was for the best. That she couldn't keep watching Lockwood throw himself into the fire, reckless and unbreaking. That leaving was the only way to save herself. But when he shows up at the quiet little book café where she works, asking-begging-her to come back, old wounds split open, old feelings resurface, and suddenly, the space between them feels dangerously thin. Because everyone knew they were in love. Except them. But nothing stays buried forever. Conspiracies unravel, near-death experiences stack up, and soon, they're questioning everything-their choices, their past, and just how much they're willing to risk for each other. Because it's Lockwood & Co. And nothing is ever that simple.