Colonization: Second Contact

In this gripping expansion of Harry Turtledove's World War tetralogy, set during the tumultuous 1960s, humanity faces an existential threat as alien colonization looms. Against the backdrop of a nascent space race, the United States, the Soviet Union, and Nazi Germany remain mired in their own conflicts, unwilling to unite against the extraterrestrial menace. The saga explores the high stakes of survival, as the potential consequences of defeat could lead to humanity's conquest and extinction.