On a sunny Sunday afternoon in Hyde Park, there's more than just the sounds of nature in the air.There's the threat from the mysterious murderer roaming the footpaths. There's the music from the festival where a recently released criminal is about to unleash havoc. And there's the chance at revenge for a heroic couple who never thought they would get it...20 Minutes. 20 People. 20 reasons this is more than just a walk in the park.