Full week lesson on the unsolved mystery of D.B. Cooper. What happened to D. B. Cooper?? This resource presents a non-fiction mystery in which students have to read to understand clues and piece this story together. Your students will talk about this lesson for months after! "D.B. Cooper” was the alias used by a still-unidentified man who, the day before Thanksgiving, 1971, hijacked a commercial airplane and extorted a ransom of $200,000. After receiving the money, Cooper parachuted from the pla