Lockwood & Co. is a series of supernatural detective novels written by Jonathan Stroud. As of my knowledge cutoff in September 2021, there are five books in the series: "The Screaming Staircase," "The Whispering Skull," "The Hollow Boy," "The Creeping Shadow," and "The Empty Grave." However, I'm not aware of any specific information about a book titled "Lockwood & Co. (2023)" or any new developments in the series beyond that point.

The series is set in an alternate version of modern-day London, where ghosts have become a dangerous and pervasive problem. Only children and teenagers possess the psychic abilities needed to see and interact with these supernatural beings. The main characters, Lucy Carlyle, Anthony Lockwood, and George Cubbins, are members of a small ghost-hunting agency called Lockwood & Co.

Throughout the series, Lockwood & Co. investigates various supernatural cases, battling ghosts, spirits, and other paranormal entities. They use a combination of psychic talents, research, and specialized tools to uncover the truth behind these hauntings and protect the living from the vengeful dead.

Each book delves into a new haunting and uncovers more about the overarching mystery behind "the Problem" (the ghost epidemic) and the origins of the ghost phenomenon itself. The series features a blend of mystery, suspense, humor, and adventure, with well-developed characters and a richly imagined supernatural world.

Please note that if there is a new book released after my knowledge cutoff, I won't have information about it. I recommend checking recent sources or Jonathan Stroud's official website for the most up-to-date information on the Lockwood & Co. series.

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