Elspeth and Angus can't find the Nessies, until they spot Careful-Ness hiding in the woods. It turns out Baby-Ness has given them all measles. The two children go to buy sticky sweets to cheer Baby-Ness up, but on their way they are spotted by nasty Willie McFuzz, son of Sergeant McFuzz, and his friend Tubby. The two follow Elspeth and Angus to steal their sweets - not bargaining for finding a huge spotty monster at the end!