D. A. Diamond

Detective Bill Holiday has carried the Calloway case his entire career. Jack Preston has carried the memory of what he did. When their paths cross on a quiet street, both men understand that knowing is not the same as proving - and that justice, when the system fails, must be built from what remains. He Walks Among Us is a haunting, brilliantly constructed dual-perspective novel of obsession, guilt, and the limits of justice - told by the detective who would not forget and the killer who could not stop.
The Bill Holiday Series begins here.