The Terror: A Mystery is a 1917 novel by Arthur Machen, a Welsh author known for his works in horror and the supernatural. The story is set in a small, isolated English village, where strange and unsettling events begin to occur, causing widespread fear and paranoia among the residents. This novel, which combines elements of mystery, supernatural horror, and psychological thriller, was Machen’s last full-length novel and has gained critical recognition for its exploration of fear, paranoia, and the unknown.