Detective Everett Larkin of New York City’s Cold Case Squad has been on medical leave since catching the serial killer responsible for the Death Mask Murders. But Larkin hasn’t forgotten the anonymously delivered letter, nor its suggestion, that another memento—another death—is waiting to be found. Summer brings the grisly discovery of skeletal remains deep in the subway system, but the circumstances resemble one of Larkin’s already open cases, so the elite detective resumes active duty. When a postmortem photograph, akin to those taken during the Victorian Era, is located at the scene, Larkin requests aid from the most qualified man he knows: Detective Ira Doyle of the Forensic Artists Unit. With an unsolved case that suffered from tunnel vision, and the deconstruction of death portraits, Larkin and Doyle are descending down a rabbit hole as complex as the tunnels beneath Manhattan. And if this investigation wasn’t enough, both detectives are struggling with how to address the growing intimacy between them, because sometimes, love is more grave than murder.