12 - Time Traders by Andre Norton

In a world where conquering space seems possible, could conquering time be next? This is the tantalizing theory that American scientists are investigating as they seek to unravel the source of the Russians newfound knowledge. What if Russian scientists had discovered a way to travel back in time to uncover the secrets of the past? Enter young Ross Murdock, an intelligent but fiercely independent nonconformist, who finds himself entangled in a top-secret government project at an Arctic base. His unique traits, which often make him a rebel in society, become essential as he assumes the role of a merchant trader from the Beaker people during the Bronze Age. Once transported via time machine to the remote Baltic region where a Russian outpost lies, Ross and his partner Ashe are thrust into a thrilling adventure filled with Russians, superstitious prehistoric men, and the enigmatic aliens of a lost galactic civilization, demanding every ounce of courage they possess.