The inhabitants of the Popcorn Islands lead a peaceful and comfortable existence - that is, until pirates attack Captain Foster's ship on its way to America and steal half the popcorn harvest. So Lucy, Hermione and Sam offer to accompany the captain and his dog Biscuit on the next trip to keep a lookout for danger. But danger is exactly what they run into! Now the pirates aren't just after more popcorn ...they want new recruits too!