One Silver Summer - Rachel Hickman

After losing her mum in an accident, Sass is sent to live with her uncle in England. Far from her native Brooklyn, the rocky shores and crumbling castles of Cornwall seem like the perfect place to hide her grief. And when she stumbles across a silver horse in a sunlit meadow Sass feels a surprising sense of peace... only to have it broken by a boy. Arrogant and distrustful, the horse's trainer, Alex, doesn't approve of the trespassing American. Yet after a few chance meetings, he begins to feel a connection to the curious girl with the sad eyes, and offers to teach her to ride. Sass never expected to feel anything again - least of all love - but the lessons reveal a far different Alex, and soon their friendship turns into something more. But Alex has a secret - a bombshell about his family that could shatter Sass's trust... and force him to abandon the one girl who made him believe in himself.