This riddle has been around for some time on internet platforms such as Instagram, Facebook, and WhatsApp, and many people still argue over what the answer might be, as there are many possibilities. The correct answer is Tom is the killer and Bill spoke the truth. If Bill was the killer, both Tom and Harry will be telling the truth. If Harry was the killer, none of the statements will be true. If Mike was the killer, none of the statements will be true.