 According to the unified analysis of descriptions, what Detective Brown literally expresses is not the idea that there was a unique murderer of Smith who is insane. To the contrary, he literally expresses the proposition that there is at least one murderer of Smith who is insane. By applying Gricean principles in this context we have made out that Brown intends to say that there is a unique murderer of Smith and that he is insane. We are pulled in two directions by this case because what Brown has said is literally true but what he intended to communicate was, strictly speaking, false.