During the 1920s, in more than a dozen cities, over four years, and across two continents, women were being butchered. Eyewitneses claim the perpetrator was a hulking Bible-carrying brute who lumbered on all fours, and laughed maniacally with each new slaughter.

The crimes haunted San Francisco Police Captain Charles Dullea, the last honest cop in one of the most notoriously corrupt departments in the country. But nothing could have prepared Dullea for where the case- and the truth-would take him.