Lucy Carlyle is a fictional character from the popular book series called "The Lockwood & Co." written by Jonathan Stroud. She is a young and talented ghost-hunter who works alongside her friends at a small agency that deals with supernatural occurrences. Lucy is known for her strong intuition and ability to communicate with spirits, making her an essential member of the team. In the series, Lucy often faces various challenges, including dangerous ghosts and rival agencies. Her character is portrayed as brave and resourceful, showcasing her determination to protect others from the paranormal threats that plague their world.