A1+ (Thriller)Jack and his friend Mitchell are going to ‘Walk the Wall’ – they’re going to walk for eight days along Hadrian’s Wall, the old Roman wall in the north of England. ‘It’ll be easy,’ says Mitchell. But the walk isn’t easy. The boys get sore feet and tired legs. There are hills to climb, and there’s rain. Then they make a terrible discovery, and a difficult walk becomes a dangerous adventure.