The Key to You and Me by Jaye Robin Brown 

Piper Kitts is spending the summer living with her grandmother, training at the barn of a former Olympic horseback rider, and trying to get over her ex-girlfriend. Much to Piper’s dismay, her grandmother is making her face her fear of driving head-on by taking lessons from a girl in town.

Kat Pearson has always suspected that she likes girls but fears her North Carolina town is too small… Read more.