Meredith Bond 
Bridging the Storm [EPUB ebook] 

A reason to live . It’s all Sir Dagonet wants. He’s been alive for over a thousand years and there is no end in sight thanks to a “gift” from the great wizard Merlin. But now, thanks to an invitation to the home of the high priestess of the Vallen, he might very well be given this most priceless gift.
A life with reason. Kate Cherrington is trapped at her aunt’s home with no way out and no future to look forward to—until a knight with an incredible secret comes to visit. Now there is hope for Kate. The possibility of a way forward, of a life of her own.
Bridging the gap between what is and what could be might be within their sights, but first, they’ve got to get past one determined to stop them and who has the power to do so.