Canada’s Giller Prize will be awarded on Tuesday, which means the window for guessing the winner is closing quickly. But handicapping the Giller has always been tricky, and this year, even picking a frontrunner is a struggle. “What drives the Gillers? According to Calgary novelist Aritha van Herk, it’s ‘a weird mixture of circumstance, accident, the chemistry of jury members and the books published, what the publishers chose to submit, and the publishers who have the money to pay the entrance fee. There must be a math equation for that.'”