In the cemetery on the edge of Dunnville, Ontario, there's a grave with no headstone. A wooden cross marks the spot where Troy Armstrong is buried ; and it won't be replaced with a permanent marker until Don Armstrong finds the killer of his son. "Troy was killed. He was murdered," says Armstrong. "I don't care which way you look at it. He was hit by a truck. The man ran. And he's not going to get away with it. I'll see to it personally." But who that man is remains a mystery. For more than six years, a mystery that has hung over this town of 12,000 not far from Hamilton, breaking up marriages, destroying friendships and feeding endless speculation and rumour.