That Cold Day in the Park (1969)

Unmarried and lonely Sandy Dennis spies teenager Michael Burns stranded in the park across from her home during a rainstorm and invites him to stay with her. Regrettably for both of them, they do not know enough about each other for this arrangement to work. There’s a sense of impending dread that resonates throughout the film and I was fully expecting it to play out similarly to the end of The Roman Spring of Mrs. Stone. There is absolutely no one else I can think of who could play the necessary aspects of the complex main character as Dennis and she carries this unusual film from its first moments.