The late John E Mack was an eminent Professor of Psychiatry at Harvard University and a Pulitzer Prize winner.
He was also passionately interested in the universal phenomenon of alien abduction.
Harvard University found his research irrational and tried to stop it.
Sue Nelson tells the story of Mack's battle with his academic colleagues to keep an open mind and his struggle to understand those who claim to have been abducted.
His plea was as much for them as for the future of psychiatry.