"Death Game" (1975) Sandra Locke

☆PLOT:
In October 1975, George Manning, a successful San Francisco Bay Area businessman, is left home alone on his 40th birthday while his wife Karen tends to a family emergency. A thunderstorm begins that evening and George is greeted at the door by two attractive young women, drenched from the rain. The ladies, who introduce themselves as Jackson and Donna, explain to him that they intended to reach an address for a party on the other side of town when their car broke down. He invites them inside to dry off and make a call for a friend to pick them up.
After the three chat pleasantly for a while, Jackson finds her way to a bathroom sauna. Donna eventually joins her, and George, curious about where they had gone, walks in on them bathing in the hot tub. The happily-married man is then seduced and coerced into sex with the two strangers. The following morning George awakes to find his guests cooking breakfast. Surprised that they had not left the night before, George is given a vague excuse as to why they never departed.
It quickly becomes apparent that the girls have no intention of leaving. They become uncooperative, obnoxious, and defiant of George as they begin rummaging through the house's contents, putting on his wife's clothes, and even vandalizing the property. George, increasingly upset over their unwelcome presence, threatens to call the police. He stops when Jackson claims that the two are underage, and if caught he could face charges of statutory rape, a lengthy prison sentence, and the dissolution of his family life and career. After narrowly avoiding the girls being discovered by a visiting maid, George attempts to contact the authorities once again before Jackson agrees that they will leave on the condition that George drive them.
George drops the two off at a city bus stop on the opposite side of the Golden Gate Bridge and makes the trip home that night, glad the ordeal is seemingly over. However, his relief is short-lived, as Jackson and Donna ambush him inside his home and knock him unconscious. The duo ties George up with bedsheets and subject him to physical and emotional abuse while continuing to trash the inside of the house, and painting their faces with his wife's makeup. Their sadistic and often bizarre actions escalate as the night goes on.
After George cries for help to a grocery delivery man, the girls usher the unfortunate courier into the living room, bludgeon him, and drown him in a fish tank. George's few struggles to escape fail. George tries to reason with his captors. At one point Jackson reveals to him that her unhinged behavior is due to her own father having sex with her. The girls hold a mock trial amongst themselves to determine if George should face punishment for the supposed sexual crimes he committed the previous evening.
At midnight, Jackson, acting as both a witness and judge, announces his guilty verdict and sentences him to death at dawn. When the six o'clock hour rolls around, Donna holds a now-exhausted George down while Jackson proceeds to carry out his execution using a large cleaver. She spares his life at the last moment and the pair finally take off, laughing maniacally. As the women stroll gleefully through the neighborhood, they stumble into the street and—not paying attention to their surroundings—are struck head-on by a speeding van.