For more than fifty years, Britain has been terrorised by an epidemic of murderous ghosts. A number of Psychic Investigations Agencies have sprung up to destroy them - with mixed results . . . Lucy Carlyle, a talented young agent, arrives in London hoping to begin a shining new chapter in her career. Instead she finds herself joining Lockwood & Co., the most ramshackle agency in the city, whose ineptitude is matched only by the charisma of its owner. But Lockwood & Co. have one last chance for redemption. All they have to do is spend the night in one of the most haunted houses in England . . . and come out alive.