Reading progress update: I've read 20%.

Rapture in Death - J.D. Robb, Susan Ericksen

Oh we finally get to see from the killers POV. Just a wild guess I bet you it was the guy that Eve just met in her home - I could easily be wrong as we have only just started getting into the deaths, maybe we haven't even met the murderer yet. But for now I'm going to guess its him - I suppose it could be the female but Nora seems to lean more towards male killers.