Thanks to his fascinating main character, John Cardinal, a First Nations cop who turned loner when his wife was murdered, Giles Blunt has become one of Canada's premier mystery writers. In Until The Night ($29.95, Random House), set mainly in two frigid locations, the high Arctic and Algonquin in winter, corpses keep turning up for reasons Cardinal and his cohort, Lisa Delorme, are assigned to figure out. Expert at characterization and setting, Blunt has received Britain's and Canada's major mystery writing awards. Until The Night's right up there with his best. He launches the book Tuesday (August 14) at the Gladstone. See listing.