While investigating a cruise ship, Sakuya Outsuki learns of a tragedy that shouldn't have been possible: His own father, the legendary Immortal Detective, is dead! If that wasn't bad enough, all the sleuths working for his dad have leftft as well. To protect his father's agency--and ensure they have a home to return to--Sakuya and his assistant, Lilithea, must truly work as one. In this fifinal volume, can they solve the murder mystery at the perplexing Kowloon's Hotel?