There’s good news and bad news when it comes to Spiral: From the Book of Saw. The good news is you don’t need to rewatch any of the eight previous Saw films to completely understand what’s going on here. The bad news is, devoid of that dense mythology, the film lacks a much-needed identity and originality. The ending does its best to change that, and there are some good moments along the way. Ultimately, though, the film is a letdown. Saw franchise — stars Chris Rock as Zeke, a police detective loathed by everyone in his precinct because several years prior, he ratted out a dirty cop who killed an unarmed man. He’s forced to take on a new partner, William (