Christmas at the Castle by Melissa McClone

A royal wedding. A meddlesome mother. An unexpected union.

A European getaway during the Christmas holiday is exactly what veterinarian Katrina “Kat” Parsons needs. She can’t wait to be a bridesmaid in her childhood friend’s royal wedding, but she hopes to steer clear of the bride’s arrogant older brother.
Crown Prince Guillaume wants his younger sister’s wedding day to be perfect, but he’s suspicious of Kat. He and his mother on are on high alert, afraid Kat is not just there for the wedding, but also to find a prince of her own.

But when Kat’s kindness and generosity prove them wrong, the prince realizes there’s more to her than he ever imagined. Can he trust his heart or will he lose the one woman he can’t live without?