Walter D Allan, 84, left Tobermory, Ontario on July 18, 2017 for the Royal Canadian Numismatic Association conference in Boucherville, Quebec and never arrived. The last confirmed sighting was July 21 at a gas station in Sainte-Brigide-d'Iberville, about 60 kilometres from his intended destination. Organizers say he did not attend the conference.

Allan, a retired pharmacist described as five feet eight inches, thin, with white hair and a full white beard, lived with Parkinson’s disease and had been suspended from driving. His red 2007 Ford Focus station wagon was later found abandoned in a rural area of Saint-Barthélemy, roughly 100 kilometres northeast of Montreal; there was no sign of him when the vehicle was located. The Ontario Provincial Police and the Sûreté du Québec appealed for information.

What did anyone in the Sainte-Brigide-d'Iberville or Saint-Barthélemy areas see around July 21–23 that might explain where Walter went?