The one that got away.
Meg's heard the expression before, but now she truly understands it.
She wishes she didn't.
Because the one that got away was the horse that tugged at Meg's heartstrings.
Meg's going to need the help of best friend, Slate, and brother, Cam, to make sure she doesn't miss out on her next heart-horse, and to set her up for her first fateful appaloosa summer on the island.