Dying Room Only (1973)

Plot

A couple on a remote desert road at night pulls into a diner for a break. When the husband heads to the restroom and fails to come back, his wife grows increasingly anxious. As time passes and her concern deepens, she starts to fear that something sinister has occurred. With no sign of her husband and the diner’s staff acting strangely, she must confront the chilling possibility that he may have vanished under dire circumstances. Tension rises as she battles against time and her growing dread.