The Empty Grave, by Jonathan Stroud, was published in 2017 by Hyperion. It is the sequel to The Creeping Shadow.
Five months after the events in The Creeping Shadow, 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? This is just one of many questions to be answered in Book Five of the Lockwood & Co. series. Will Lockwood ever reveal more about his family’s past to Lucy? Has their trip to the Other Side left the two of them changed forever? Will Penelope Fittes succeed in shutting down their agency—and does she threaten something deeper still? The young operative smut survive attacks from foes both spectral and human before they can take on their greatest enemy in a climactic and chaotic battle .And to prevail they will have to rely on some surprising—and shadowy—allies.