The Touch of a Shadow – Cheri Vause

The second book in the Shadow series begins in 1965, when Esther Charlemagne and Aiden “Mac” McManus will have to revisit a case from 1959, while they were still on the elite homicide squad of the NYPD. The FBI steps in to help secure Esther and Mac in a safe house, to prevent the serial killer from making good on his threat to kill them. But Mac returns to the City to find the killer himself, and save his beloved Esther.