Aristotle established three rules or unities for tragedy - unity of action, time, and place. The passage discusses these classical unities, with unity of action referring to a single plotline and minimal subplots, unity of time restricting the action to 24 hours, and unity of place setting the entire play in a single location. It then provides details about the 2005 film Hostage, directed by Florent Emilio Siri, about a hostage negotiator whose own family is kidnapped as he works to save another family, exploring the tension between his personal interests and professional responsibilities.