Elm's oldest apartment building, built by a Japanese art dealer in the late 1800s, seems to be haunted. Especially at night, frightening and inexplicable things happen, and the residents are so scared that they are considering moving out. Ito and Miu Nakanishi own the house and run a kendo school on the ground floor. They are becoming desperate and ask the Sub Rosa detectives for help in finding out what evil force is trying to take over the house. Is there a curse on it? Could it be an evil kitsune—a Japanese spirit? In the third adventure of the Sub Rosa detectives, siblings Grip and their friends learn about everything from Japanese kimonos, swords, and haiku poems to skulls, secret passages, and magic.