Myriam Isabella Kniaz was 16 when she disappeared from Sainte-Foy, Quebec. She was last seen at the foster home where she was residing on November 15, 1981, after telling staff she was going outside for fresh air and did not return. At the time she was described as a Caucasian female, 5 feet 5 inches, about 112 pounds, with brown hair and brown eyes. She was wearing blue jeans, brown shoes, a blue and white vest, and a short light green coat.

Myriam was an American citizen who had been living in Canada and was fluent in French and English. The months before she vanished were emotionally difficult: her parents were divorcing, she experienced severe depression, spent time hospitalized for treatment, then lived at a youth centre. She had a history of running away from foster and group homes, which initially led investigators to consider that she left voluntarily. She had given her mother Christmas presents shortly before disappearing.

Unconfirmed leads in 1990 suggested she might have been in Kansas or Missouri, but those tips did not locate her. Both of her parents have since died. The disappearance remains unsolved and open. If anyone knew Myriam, saw her in late 1981, or has information about the reported sightings in the United States, please come forward.