Love & Luck by Jenna Evans Welch

Addie is visiting Ireland for her aunt’s over-the-top destination wedding, and hoping she can stop thinking about the one horrible thing she did that left her miserable and heartbroken—and threatens her future. But her brother, Ian, isn’t about to let her forget, and his constant needling leads to arguments and even a fistfight between the two once inseparable siblings. Miserable, Addie can’t wait to visit her friend in Italy and leave her brother—and her problems—behind.

So when Addie discovers an unusual guidebook, Ireland for the Heartbroken, hidden in the dusty shelves of the hotel library, she’s able to finally escape her anxious mind and Ian’s criticism.

And then their travel plans change. Suddenly Addie finds herself on a whirlwind tour of the Emerald Isle, trapped in the world’s smallest vehicle with Ian and his admittedly cute, Irish-accented friend Rowan. As the trio journeys over breathtaking green hills, past countless castles, and through a number of fairy-tale forests, Addie hopes her guidebook will heal not only her broken heart, but also her shattered relationship with her brother.

That is if they don’t get completely lost along the way.