A year has passed since the Cold Heart murders and Detective Petra Connor is, once again, working Hollywood Homicide solo. She has just solved three gang-related killings and is feeling pretty good about herself – about life in general – when Isaac Gomez waltzes into her office and tells her he's found something she might want to take a look at. A twenty-two-year-old prodigy researching a Ph.D. in sociology, Isaac has gained access to LAPD case files. But while combing the files, the brilliant young man has come upon a series of apparently unrelated murders all committed shortly after midnight on the exact same date: June 28. Can this be purely coincidence? As Petra 's curiosity leads her to investigate further, she becomes convinced that something evil has managed to conceal itself within the dry pages of the cold-case files. Killings so diabolical and meticulously constructed that they would have remained invisible but for the probing mind of a young, naive genius. To make matters worse, June 28 is only a month away…