Midnight Fear by Tentler, Leslie

"I trusted you, Caity" The still of the night is once again shattered by Caitlyn Cahill's recurring nightmare—her brother standing before her, gripping a butcher knife, his eyes black with hatred. Two years ago, the former Washington, D.C., socialite defied her powerful senator father and risked the ruin of her family by helping the FBI link her troubled brother to a string of horrific murders. "The Capital Killer" was sent to prison for life...and Caitlyn's entire world fell apart.

Now, FBI agent Reid Novak is forced to rend the peace Caitlyn has found on a rural Virginia horse farm. A copycat killer is on the loose and slowly toying with Caitlyn—his ultimate target—in a terrorizing cat–and–mouse game. Almost destroyed two years ago by Caitlyn's family, not to mention the Capital Killer's haunting final murder, Reid vows to save the woman he's never forgotten or die trying.