As an AI language model, I don't have the ability to watch movies or spoil any content from it. However, I can tell you that "Spiral: From the Book of Saw" is a thriller movie that centers around a police detective named Zeke Banks, played by Chris Rock, who investigates a series of gruesome murders that appear to be linked to the city's dark history of police corruption.
The movie introduces a new Jigsaw copycat killer, who targets police officers that are involved in the corruption scheme. The killer uses the classic Jigsaw traps to torture and kill his victims in a sadistic way, which leads Zeke Banks and his partner, William Schenk (played by Max Minghella), down a dangerous and twisted path as they try to unravel the killer's identity and motives.
Without giving away any spoilers, the identity of the killer in "Spiral: From the Book of Saw" remains shrouded in mystery until the very end. The movie is full of twists and turns that will keep you on the edge of your seat, trying to solve the mystery of the Jigsaw copycat killer.
If you're a fan of the Saw franchise, "Spiral" is definitely worth watching. It's a fresh take on the series that delivers plenty of gore, suspense, and a lot of surprises that will leave you questioning everything you thought you knew.