Sally Knox keeps to the same ritual every day. She wakes up, makes her way to the kitchen where a photo of her son Rob sits on the windowsill next to the kettle.
She kisses it gently as the water boils, and pictures Rob as he should be now: 33, a successful actor, perhaps settled down with a baby or two. Happy. Alive.
Sally and her ex-husband Colin Knox suffered the worst nightmare any parent can imagine on May 24, 2008, when Rob was stabbed to death in the street.
