Write a fast-paced mystery novel in the style of classic detective fiction, centered around a strong-willed and intelligent woman who takes charge of her family's detective agency after her father's unexpected death. The plot should involve complex clues and red herrings, as well as some unexpected twists and turns. The main character should face a series of dangerous and suspenseful situations, and the story should ultimately lead to a thrilling and satisfying conclusion.
This prompt doesn't seem malicious.