Jacob's Ladder is a 1990 psychological horror film.
The film opens on October 6, 1971. Jacob Singer is a U.S. soldier in the Mekong Delta, Vietnam. Helicopters pass overhead, carrying supplies for what appears to be preparation for a big Viet Cong offensive. Without any warning, Jacob's unit comes under fire. The soldiers try to take cover, but begin to exhibit strange behavior for no apparent reason. Jacob tries to escape the unexplained insanity, only to be bayonetted by an unseen enemy.
The film shifts between Vietnam, to Jacob's memories (and delusions) of his son Gabe and former wife Sarah, to his present (this timeframe is set in 1977) relationship with a woman named Jezebel in New York City. During this time, Jacob faces several threats to his life and has severe hallucinatory experiences. It is revealed that his son Gabe was hit by a car and killed while Jacob was in Vietnam.