That Cold Day in the Park is a 1969 psychological drama thriller film directed by Robert Altman and starring Sandy Dennis.

Based on the novel of the same name by Richard Miles and adapted for the screen by Gillian Freeman, it was filmed on location in Vancouver, British Columbia, where the events occur.

Frances Austen, a woman who has inherited her late parents' Vancouver apartment, notices a nineteen-year-old boy sitting in the rain in a nearby park and invites him inside.

Frances runs a bath for him, gives him a meal, and makes up a bed in her spare room; when the boy has settled down for the night, she quietly locks him in.

Mrs. Parnell remarks that the cookies are burnt, but Frances opens an expensive bottle of wine to accompany them; neither woman notices their real nature.

Meanwhile Frances has had a contraceptive diaphragm fitted and dispensed at a local family planning clinic; she then goes to play lawn bowls with a group of friends, most of them people much older than herself.

Finally she lies down on the bed and asks the boy to make love to her - only to discover that no one else is there, and the shape under the bedcover is made of dolls and stuffed toys.

There are some of the same exploitation angles as Rosemary's Baby (clinical discussions of reproduction, an eerie apartment, strange games), but they just don't work.