Lockwood & Co. is a young adult supernatural thriller series by Jonathan Stroud.
It follows three young operatives of a psychic detection agency (Anthony Lockwood, Lucy Carlyle and George Cubbins) as they fight ghosts (known as Visitors) in London, England.
The series consists of five books: The Screaming Staircase, The Whispering Skull, The Hollow Boy, The Creeping Shadow, and The Empty Grave, published from 2013[1] to 2017.
[2] A short story was released over six days in late October 2013 on The Guardian's website.
It was written by Stroud, with input from readers to decide the location, the type of ghost, and its title, which became The Dagger in the Desk.