Night's Landing by Carla Neggers

The novel is typical of this author, romance + suspense combined in an easy writing style. A quick read.

Sarah Dunnemore, an archaeologist by profession, returns home after having finished her latest project, a biography of the president Poe's family, roots and house, and is now wondering what should she do next. The answer comes right away with a phone call that her brother, a deputy marshal has been shot and is in the intensive care in the hospital. She immediately takes off to New York to visit him, and in the process meets her brother's colleague, Nate, who has been also shot, but not as gravely as her brother.
Of course Nate is the typical male so eloquently described in these sorts of romances, all rugged and rough, with that wicked sexy smile and direct look at you which undresses you to the soul.

The action also unfolds from here. Urged by her brother, Sarah goes back home to Night's Landing, where (of course) Nate follows her almost immediately.
The rest is left to your imagination and invites you to read the book :)

Several copies of the book (including mine) can be found here.