“Spiral: From The Book Of Saw” (** out of four) was a mild horror thriller about a world-weary police detective (Chris Rock) working on a case of suspicious torture deaths that bring back terrifying memories for him when he himself was held hostage and tortured. Could these be the ongoing works of Jigsaw or one of his sick imitators? More of a police procedural drama than “Saw” torture-porn and remains watchable but never builds to a satisfying whole or takes off. Rock ranges from effective to (unintentionally) funny at times but it’s a strange vehicle for him to star in; Samuel L. Jackson provides some welcome style and laughs as his father. Still, even series fans will likely feel as if they “saw” this one many times already.