Since his drowning in 1917, Tom Thomson has been recreated by poets, playwrights, novelists, filmmakers, biographers, and other artists as a legendary figure synonymous with Canada and its northern identity. Touted as a great artist cut off in his prime, his mysterious death in Canoe Lake, Algonquin Park, and the controversy about his final resting-place fired the popular imagination and raised him to the status of a national hero. In "Inventing Tom...