Based on the true story of the largest one-man bank fraud in Canadian history.Dan Mahowny (Philip Seymour Hoffman), an unassuming bank manager with an obsessive gambling habit and a job that gives him access to a $20 million account. When a major losing streak leaves him unable to cover his losses, Mahowny develops an ingenious plan to play the bank against the casino. With time running out and the odds stacked against him, obsession becomes compulsion and the thrill of the bet is quickly replaced with a primal desire to stay in the game.