A thrill cannot be quenched without reason. Secret of the Moonlight delivers a lot, in very little.
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.