Jess Ward joined the Wesberrey Walkers to get fit. But it might be the death of her! Obliged to look after her older sister's handsome and driven Brazilian lover, Jess introduces Frederico to the local walking group. With the annual Wesberrey Walkathon a few weeks away, everyone has their sights on the prize, but is there someone in the group prepared to kill for it? A mysterious illness lays low several walkers...