Stranger King

Lena Greenwood is known as a "Daywalker", a select type of mercenary who has adapted to working in the deadly radiation of post-war British Columbia. When their city is invaded by the Mokai, a hostile alien race, she and her company escape into the Canadian Rockies.Thegn, a representative of the Mokai, is captured years later by the Manthras company and kept hostage in their bunker. He sets about documenting the rest of human knowledge, while trying to survive himself.