Adapted from John Le Carré's novel by the Brazilian director of "City of God," this engrossing, high-stakes political thriller tackles the conspiratorial collusion of Western governments and pharmaceutical giants administering HIV treatment in Africa's beleaguered nations. Mereilles clearly wants us to identify with the downtrodden, and his visceral visual style and nonlinear storytelling grip us right from the start. Fiennes brings a dry gravity to his character's predicament, and Weisz couldn't be better as an antagonistic advocate who keeps her political activities a secret from her husband, a man content to shut out the world in his patio garden. Cynical and captivating, "Gardener" grabs you and never lets go.