To summarize: <5% of reported UFO sightings are unexplainable. These break the laws of physics and are real but not physical. Those who see them have invited them by dabbling in occultic practices; once they stop, the appearances cease. Conclusion: demons.
Dr. Ross, as a Christian astronomer and subsequently as a pastor, then as the founder and president of a science-faith think-tank, has decades of personal experience investigating these incidents. You can't go wrong with this book--nor with any of his.
If you read up on man-made flying saucers you’ll find that 5% unexplainable data dwindling down to 0.5% or less.