First study the article. I let them work with a partner on vocab, then we do the listening gapfill. After checking, students work in pairs or groups to complete the rest of the activities.
Most of my students hadn't heard of most of these mysteries or conspiracies... so it didn't work as well as I dreamed. If you have a computer in your class you might want to make a PPT with some pictures or a show a youtube video to go along with it.
This lesson was designed for a 2 hour class of adult intermediates.