All that remains is a note: "Gone to get pancakes." Her 30th birthday party's over, yet it's the happiest Emma Watters has ever been. Life couldn't be more perfect. She's an emergency room doctor and shares a home in Toronto with the love of her life, Adam Davison. The next morning, Adam is gone. Emma's shocked. At first, she decides that Adam's having an affair and scavenges through photos on Facebook, trying to identify "the other woman." But as...