A detective investigating a series of murders becomes involved with a woman who may be the culprit.

In the Salinas Valley in and around World War I, Cal Trask feels he must compete against overwhelming odds with his brother for the love of their father. Cal is frustrated at every turn, from his reaction to the war, how to get ahead in business and in life, and how to relate to his estranged mother.

Fifteen years after the original film, the philosophical Lieutenant William F. Kinderman is investigating a baffling series of murders on Georgetown that all contain the hallmarks of The Gemini, a deceased serial killer. His investigation eventually leads him to a catatonic patient in a psychiatric hospital who has recently started to speak, claiming he is The Gemini and detailing the murders, but bears a striking resemblance to Father Damien Karras.

Desperate to land a man on the moon before Russia does, NASA hastily preps a would-be spaceman for a mission that would leave him alone in a lunar shelter for a year.