Mischief at Sea

This story is about two siblings, Daniel and Holly Nugent, who are taken on a family holiday aboard a Cruise ship. They soon discover that two bullies from Daniels school, Arty The Artichoke Nevin and his beefy brother Billy Nostrils, are also onboard. They then discover a further group of boys on the ship known as the South Side Locos who make Arty and Billy appear tame by comparison, and conspire to set the two groups against each other, thus distracting the bullies from harming them. The Nevin brothers finally become allied with Daniel and Holly to defeat the South Side Locos.