In a morbid city, police often resorted to a super detective who tackles the cases that seem unsolvable. The killings under the Moonlight haunted everybody in the city of Finnevile. The only distinguishable patterns were the sudden disappearances, just a smudge of blood on the walls and an eerie Moonlight Symphony playing whenever a victim was found. Growing restless, the renowned detective resorts to some unpopular tactics to put an end to the murderous rampage.
A number of unsolved cases demand the attention of a famous detective, known for tackling a lot of mysteries with success. His success rate has garnered him enough reputation that criminals fear. Isabelle is the girlfriend of Calvin Greyson, son of the well-known Jack Grayson, and after he receives a threatening letter, she runs off to the police to seek their help.