Love at first book / Jenn McKinlay.

Enhanced descriptions from Syndetics:

When a librarian moves to a quaint Irish village where her favorite novelist lives, the last thing she expects is to fall for the author's prickly son... until their story becomes one for the books, from the New York Times bestselling author of Summer Reading .

Emily Allen, a librarian on Martha's Vineyard, has always dreamed of a life of travel and adventure. So when her favorite author, Siobhan Riordan, offers her a job in the Emerald Isle, Emily jumps at the opportunity. After all, Siobhan's novels got Em through some of the darkest days of her existence.

Helping Siobhan write the final book in her acclaimed series--after a ten-year hiatus due to a scorching case of writer's block--is a dream come true for Emily. If only she didn't have to deal with Siobhan's son, Kieran Murphy. He manages Siobhan's bookstore, and the grouchy bookworm clearly doesn't want Em around.

Emily persists, and spending her days bantering with the annoyingly handsome mercurial Irishman only makes her fall more deeply in love with the new life she's built - and for the man who seems to soften toward her with every quip she throws at him. But when she discovers the reason for Kieran's initial resistance, Em finds herself torn between helping Siobhan find closure with her series and her now undeniable feelings for Kier. As Siobhan's novel progresses, Emily will have to decide if she's truly ready to turn a new page and figure out what lies in the next chapter.