Vendetta by DL Pawlowski

Nicole (Nic) Stone is a career-driven narcotics detective with a haunting past. Unwilling to allow herself to love anyone since her parents' brutal murder, she's spent the past ten years isolating herself from everything but her job. Now Fate has other plans for Nic. After someone tries to kill her partner in cold blood, she meets Carly Jamison, her partner's younger sister. An instantaneous and undeniable attraction catches both women completely off guard and totally complicates both their lives. Can Nic protect her partner and Carly from the clutches of a ruthless drug lord bent on revenge and still open her heart to the one woman who could change her life forever?