'The Shape of Rex' is a movie about sexual innocence, sexual betrayal, and the power of secrets, to feed desire, and to poison it. It's a song in two keys -- a rapturous story of young love along side a bitterly honest, forensic portrait of marriages unravelling. Everything feels fresh and original about this movie, including the gorgeous prairie landscapes and the hidden delights of Saskatoon as a perfect backdrop for adultery. The premise: our memory of first love never completely fades. And if your first love steps back into your life (wearing a black dress with a little dip in the back), watch out.