Tantei no Tantei (Light Novel)

"I want to know all about detectives, but I have no desire to be a detective." Ever since the day a crooked detective's tip-off led to the murders of her family, Sasaki Rena has been bent on exacting vengeance. With this goal in mind she joins the Detective vs. Detectives Division of the Suma Research Company, whose goal is to crack down on unethical detectives.