After their recent adventures, the Lockwood & Co team deserve a well-earned break...so naturally they decide to risk their lives breaking into a heavily guarded crypt. A building full of unsettled souls, it's also the final resting place of Marissa Fittes, the legendary and (supposedly) long-dead ghost hunter. What they discover their will change everything.

So begins a race to get to the truth behind 'the Problem' and an epic struggle against the Fittes agency. A struggle that will pit the team against the most terrifying enemy they have ever faced. Not even the dead will survive unscathed....

Jonathan Stroud once again delivers a rousing adventure full of danger, laughs, twists and frights, with incredible revelations that will send listeners back to the first book to start the series all over again.