The Empty Grave by Jonathan Stroud

Five months later, we join Lockwood, Lucy, George, Holly, and their associate Quill Kipps on a perilous night mission: they have broken into the booby-trapped Fittes Mausoleum, where the body of the legendary psychic heroine Marissa Fittes lies. Or does it? Will Lockwood ever reveal more about his family’s past to Lucy? Will their trip to the Other Side leave Lucy and Lockwood forever changed? Will Penelope Fittes succeed in shutting down their agency forever? The young agents must survive attacks from foes both spectral and human before they can take on their greatest enemy in a climactic and chaotic battle. And to… Read more.