Dear Sadie, a free exhibit at the Archives of Ontario tells the story of First World War soldier Harry Mason and his sweetheart, Sadie Arbuckle of Toronto. Their letters trace a moving love story set against the backdrop of the First World War. The exhibit, which is open Monday to Saturday, from 9am to 5pm, closes June 5. The Archives of Ontario is located at 134 Ian Macdonald Blvd., Keele campus.