Norjak the Investigation of D B Cooper

This non-fiction book tells the story of D.B. Cooper from the point of view of Ralph Himmelsbach: the lead FBI agent assigned to the case. Himmelsbach goes into behind-the-scenes detail about the investigation and reveals his own opinions on the case: that Cooper probably had a criminal record, that he'd probably received military training, and that he was familiar with the Pacific Northwest. Himmelsbach also gives the reasons why he believes Cooper died in the fall.