On the afternoon of June 4, 1972, four-and-a-half-year-old Chantal De Montgaillard vanished from Saint-Hubert, Québec. She was with her father, Claude de Montgaillard, and her two-year-old brother, François, while en route to Montreal. Around 3:30 p.m. the father stopped at a friend’s house and left the children in his truck parked at the Paul-Chagnon school lot. When he returned a few minutes later, François was still inside but Chantal was gone.

Hundreds of police and volunteers searched a 26-square-mile area using helicopters, tracking dogs and amphibious vehicles, and scoured yards and fields, but found no trace. Chantal had curly black hair and was described as trusting with strangers; she was last seen wearing grey and brown plaid pants and a white sweater.

Decades later investigators reopened the file and in the 2010s examined a potential link to Michel Derry. During a 1983 interrogation about another child murder, Derry allegedly confessed to abducting a four-year-old in Saint-Hubert in 1972 and mentioned the color of the child’s underwear—a detail not previously public and matching Chantal’s clothing—while denying he killed her. No body or corroborating evidence has been found and the disappearance remains unsolved.

Did anyone in the Saint-Hubert area in June 1972 see a little girl matching Chantal’s description or remember that school-lot parking stop?