It's the night of October 31st. Invitations have been sent and accepted. Costumes are required and debauchery is encouraged. Ghostly delights emerge at every turn. Greatest fears are waiting to be uncovered. And Draco Malfoy is behaving inexplicably as always.

Rose Weasley the Gryffindor who applies her cleverness not to her studies but to pulling off the most brilliant pranks in school, Scorpius Malfoy the Slytherin prefect who takes his position very seriously but would still rather hide in the shadows than get in her way, and their sixth year where a mysterious something begins to lurk in the corridors after lights out