Falling for a Kiss — Jennifer Geoghan

Falling for a Kiss: Book 3 in the Falling Series
After a tumultuous first year at New Paltz University, summer's finally here for Sara … but she's not exactly excited about it. Heading home to spend the next few months in Wading River should be a good thing, but for Sara, it also means she'll be parted from her fiancé Daniel until the fall.
After only a few weeks the summer takes an unexpected turn when Sara's brother asks her to spend the remainder of her break with him and his family up in Connecticut. But something's amiss in the small museum where Roger's just been hired as the new curator. When one of his employees mysteriously goes missing, Sara happily comes to Roger's rescue by agreeing to fill the vacancy.
But spending time with Roger isn't the only reason Sara's overjoyed at the prospect of a summer in Stonington. From the small lighthouse museum perched on the edge of the sea, it's only a short drive to where Daniel will be spending his vacation at her grandfather's house in Rhode Island.
Shortly after her arrival in the small seaside borough, Sara finds Roger's unwittingly fallen into company with an ancient secret society bent of defending their ancestral lands from any and all vampires. Over his head and worried he's unexpectedly brought Sara into harm's way, Roger quickly realizes his shadowy new boss has plans for his beautiful little sister.
Caught in between two worlds, Sara must find a way to keep the love of her life alive while deciding exactly how much she's willing to divulge to her big brother about the vampire that's about to marry into the family.

The Falling Series continues with:
Falling for Death
Falling for Stars
Falling for a Kiss
Falling Head over Heart
Falling Ever After