Write a story about a young detective who is called to solve a mysterious murder at a grand mansion in the countryside

Write a story about a young detective who is called to solve a mysterious murder at a grand mansion in the countryside. The detective must navigate through a web of deceit and betrayal as they uncover the dark secrets of the wealthy family residing in the mansion. With time running out and the killer still at large, the detective must use all their wit and cunning to solve the case before another victim falls.