Hide yourself away / Mary Jane Clark.

Enhanced descriptions from Syndetics:

Watch your back. Trust no one. And when a killer closes in, hide yourself away.
It should have been an ideal week during a perfect summer in "America's First Resort." But just hours before the KEY News crew arrives for their broadcasts from Newport, Rhode Island, the skeleton of a socialite who disappeared fourteen years ago is found in a dank tunnel beneath a famous mansion.
It doesn't end there. Next, the socialite's daughter is found at the bottom of the Forty Steps that lead from the legendary Cliff Walk to the ocean. And soon, the town is talking about the scandal and a killer whose work may be only beginning.
When one of the KEY News interns is killed in a suspicious car accident and another disappears, this year's crop of fledgling journalists are targets, including Grace Callahan, not so young at thirty-two, who came to the City-by-the-Sea determined to launch a future in television news. She and the other KEY interns have been told that at the end of the summer one of them will be offered a full-time position. Grace, a single mother fighting for custody of her preteen daughter, needs the job more than any of the other interns do. As their number dwindles one by one, Grace must face the real danger that lurks in an otherwise idyllic town. But can she uncover a murderer who does not want the secrets buried beneath the city's fabled mansions to come to light? With its lightning-fast pace and unpredictable twists, "Hide Yourself Away" is Mary Jane Clark at her suspenseful best.
Readers beware. You won't want to miss a word, because with a Mary Jane Clark novel, every word is a clue.