The time traders

"In order to avoid prosecution, Murdock reluctantly joins Operation Retrograde, whose members are exploring various time periods. Their goal? To find out where--and when--the 'Reds' are obtaining certain scientific breakthroughs, in order to maintain the balance of global power. An outsider in his own time, Ross becomes an outsider in other times as well, and faces one challenge after another. Will he succeed? Or will he inadvertently alter time forever?"
"In order to avoid prosecution, Murdock reluctantly joins Operation Retrograde, whose members are exploring various time periods. Their goal? To find out where--and when--the 'Reds' are obtaining certain scientific breakthroughs, in order to maintain the balance of global power. An outsider in his own time, Ross becomes an outsider in other times as well, and faces one challenge after another. Will he succeed? Or will he inadvertently alter time forever?"@en
"If it is possible to conquer space, then perhaps it is also possible to conquer time. At least that was the theory American scientists were exploring in an effort to explain the new sources of knowledge the Russians possessed. Perhaps Russian scientists had discovered how to transport themselves back in time in order to learn long-forgotten secrets of the past. That was why young Ross Murdock, above average in intelligence but a belligerently independent nonconformist, found himself on a hush-hush government project at a secret base in the Arctic."@en