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Five months after the events we know from The Creeping Shadow, we rejoin Lockwood, Lucy, George, Holly, and their new assistant Quill Kipps on a dangerous nighttime adventure. They've just broken into the trap-filled Fittes Mausoleum, the place where the body of legendary ghost buster Marisa Fittes is buried. But is it really buried there? This is just one of the many questions answered in the fifth and final book of the Lockwood & Co. Will Lockwood reveal new secrets of his family's past to Lucy? Or will the journey to the Other World change them both forever? Will Penelope Fittes, who has repeatedly threatened our friends, succeed in shutting down their company? The young agents will have to repel attacks from both worlds - human and otherworldly - before they engage in a last desperate battle with their greatest enemy.

The agents of Lockwood & Co. will stop at nothing to uncover the truth behind the Problem, and their adventures along the way are full of danger, fear, surprise, and sometimes laughter. And the discoveries they make can take you back to the very beginning of these adventures, because you will definitely want to read all the books in the Lockwood & Co. series.