Leslie Kean has written an unusual book on an unusual subject: Unidentified flying objects. But this Halloween weekend, Kean would like you to get any pictures of little green men you might have out of your mind.

Released this August, UFOs: Generals, Pilots and Government Officials Go on the Record collects statements from an unexpected array of people—senior officers in militaries around the world, a former governor of Arizona, a former senior Federal Aviation Administration manager—who tell their first hand accounts of witnessing or investigating something that their best efforts could not explain.

To read the interview, click here.