By Andre Alice Norton

“At the end of the Twentieth Century petty crook Ross Murdock is given the choice of facing a new medical procedure called Rehabilitation or volunteering to join a secret government project. Hoping for a chance to escape, Ross volunteers to join Operation Retrograde and is taken by Major John Kelgarries to a base built under the ice near the North Pole. Teamed with archaeologist Gordon Ashe, he is trained to mimic a trader of the Beaker culture of Bronze-Age Europe.” ~ Wikipedia