Vanish by Tess Gerritsen.

"Do we know the woman's name yet?"

She shook her head, eyes roaming the crime scene. This murder wasn't like the others. She was stark naked; posed and made up. She almost looked as though she were asleep.

"What are you thinking?" he asked her.

"I'm thinking that we either have two unsubs, or that this is a completely different case. Nothing here is the same."

He nodded in agreement and stood to his full height, his knees cracking the the tell of old age. "I'll get Officer Tristen to case the area, see if we have any witnesses, cameras," he looked down to the lifeless body once more. "Anything that can tell us where this poor girl is from or even where she's been."

Detective Cameron nodded and slipped on a pair of gloves. She was supposed to be leaving for her anniversary tonight, but it looked as though the city of Salem had other plans for her. She's hoped her partner would understand.