In "Dark Angel," the second in the Lassiter/Martinez Case Files series, Detectives Barbara Lassiter and Susan Martinez pick up where they left off in "Borderline." Assigned to a murder case, they discover that their suspect is much more than a one-off killer. In fact, the murderer appears to be a vigilante hell-bent on taking revenge against career criminals who the criminal justice system has failed to punish. But Lassiter and Martinez are soon caught up in the middle of an FBI investigation of a monstrous home invasion gang that has murdered dozens of innocent victims across the United...