Every Halloween, Theodore Nott opens the doors of Nott Manor for one legendary reunion. Costumes, enchanted cocktails, old friends, and just enough mischief to keep things interesting. This year, someone else was invited. When a notorious masked killer crashes the party, the Slytherin boys make one catastrophic mistake after another—mistaking real danger for Halloween theatrics. Between terrible survival instincts, endless sarcasm, and enough chaotic energy to make the killer question their own life choices, surviving the night quickly becomes easier said than done. One haunted manor. One frustrated murderer. And one group of former Slytherins sharing a single collective brain cell. What could possibly go wrong?