Grace and her best friend Aaron love helping out at Rowan Tree Stables, where their ponies are best friends too. Together, they have lots of adventures! Grace and Aaron are both working hard to qualify for the much-anticipated Dublin Horse Show. But when Aaron falls ill, Grace has to face up to the possibility of attending the biggest horse-riding event of the year without her best friend by her side. Then, on the morning they're due to leave for Dublin, there's a crisis at the stable. Will either of them get to ride?