Welcome to Sunnyside Stables and the pony holiday of your dreams! Written in diary form, each book follows a different girl's adventures at Pony Camp as she gets her very own pony to look after, makes new friends and tackles tough challenges! Millie and her pony Tally have been a team for years, so she's heartbroken when she gets too big for him. Now Tally must join the other Pony Camp ponies, and Millie has to try out new pony Magic. But Millie is determined to keep Tally and comes up with a risky plan. Will Millie land herself in big trouble?