Rule #1: Don’t investigate the disappearances. Rule #2: Definitely don’t investigate them with Mattheo Riddle. Rule #3: If you find a hidden passage beneath Hogwarts leading to secrets someone would kill to protect… Run. You break all three rules. Now students are still disappearing, the castle is hiding more secrets than ever, and your worst enemy keeps showing up exactly where you are. Which would be suspicious if he wasn’t equally convinced you’re involved. Between midnight investigations, dangerous discoveries, and a mystery neither of you can walk away from, one thing becomes painfully clear: The truth beneath Hogwarts is far more dangerous than either of you imagined. And getting trapped with Mattheo Riddle might be the least of your problems.