Kringle Falls by Lynn Oliver Hudson

Returning to her hometown of Kringle Falls, big-city librarian Andi Thatcher grapples with her feelings--both about inheriting her grandmother's library and about the intriguing Theodora Declan. Forthright antiquities agent Theodora Declan has her sights set on a coveted collection within the library. As the pair negotiate, their encounters outside the library's walls grow frequent, evolving from mere friendship to undeniable attraction. Amidst the burgeoning romance, they unearth a secret centuries in the making. But as their bond deepens, they face a choice: embrace a transformative love or make a monumental sacrifice for the greater good.