Write a thrilling mystery or suspense story about a detective investigating a series of bizarre and unexplainable murders in a small town

Write a thrilling mystery or suspense story about a detective investigating a series of bizarre and unexplainable murders in a small town. The detective soon realizes that the killer may not be human, but rather a supernatural entity with a dark and sinister agenda. As the detective delves deeper into the case, they must confront their own beliefs and fears in order to stop the killer before more lives are lost.