The corridors of time
In the 40th Century, the world is dividing into two camps - The Wardens, who control the Eastern Hemisphere, and the Rangers, who control Western. To Malcolm Lockridge, an ex-marine college student of the 20th century, the distinction between Good and Evil is an easy one to determine after he recruited by Storm Daraway, one of the leaders of the Wardens. Storm, using the cover story of hiring Lockridge to help recover some long lost Ukrainian Freedom Fighter gold buried in the Jutland, steals him away to Neolithic Denmark and fills him in on the war between the Wardens and the Rangers that is being waged across all of time. She brings Lockridge in on her side - and as her lover - and that choice is an easy one for Malcolm after Brann, the ruler of the Rangers, leads a hoard of Indo-European barbarians against the peaceful village that is hosting them in an attempt to capture Storm - which he does and then procedes to torture her for information. Lockridge escapes and seeks help. He makes his way through the local Time Corridor to Reformation Europe in search of a contact that Storm said would be waiting each All Hallow's Eve at an inn in Viborg. This contact will lead him to her cohorts who will mount a daring rescue attempt using English warriors from the 16th century. But, Malcolm must determine if he has choosen the right side in this war... or even if there is a right side; and through it all he will learn his pivotal role in the future that follows the 40th Century.
Time travel, Fiction, Fiction, science fiction, general, American Science Fiction, Time
Poul Anderson
Poul William Anderson was an American science fiction author who began his career during one of the Golden Ages of the genre and continued to write and remain popular into the 21st century. Anderson also authored several works of fantasy, historical novels, and a prodigious number of short stories. He received numerous awards for his writing, including seven Hugo Awards and three Nebula Awards.

Anderson received a degree in physics from the University of Minnesota in 1948. He married Karen Kruse in 1953. They had one daughter, Astrid, who is married to science fiction author Greg Bear. Anderson was the sixth President of Science Fiction and Fantasy Writers of America, taking office in 1972. He was a member of the Swordsmen and Sorcerers' Guild of America, a loose-knit group of Heroic Fantasy authors founded in the 1960s, some of whose works were anthologized in Lin Carter's Flashing Swords! anthologies. He was a founding member of the Society for Creative Anachronism. Robert A. Heinlein dedicated his 1985 novel The Cat Who Walks Through Walls to Anderson and eight of the other members of the Citizens' Advisory Council on National Space Policy.

Poul Anderson died of cancer on July 31, 2001, after a month in the hospital. Several of his novels were published posthumously.

Source: Goodreads