I believe there is a certain word used to describe the recount or unraveling of information to solve a mystery. Typically, in murder-mystery movies, towards the end - the climax of the movie - the actor will give a monologue describing in detail, “How it was done”. What is the word used to describe that monologue. It’s very specific but I can’t think of it! Thanks
Welcome to EL&U, Casper. I think the word you're looking for is denouement.
The Cambridge online defines this as:
the end of a story, in which everything is explained, or the end result of a situation
In murder mystery stories the denouement usually takes the form you describe, in other types of fiction, and in some factual presentations, there are other forms of denouement but the detective explaining it all and revealing one of his or her listeners as the culprit is the classic denouement of murder mysteries. Conan Doyle, Agatha Christie and the script writers of Death in Paradise all use it.