It's been two years since what citizens call "the Arrival," when an extraterrestrial body appeared in the sky above Lake Michigan during one of the largest, unchecked breakouts of Ebola the world had ever seen. With a flash of brilliant light, the celestial body, which people now refer to as "the Savior," cleansed the world of all traces of the virus. Yet detective James Harrington believes the entity to be another piece of a puzzle he's been working to solve since he was a who heralds the Eight? As murders in the city of Milwaukee pick up, James and his partner, a rookie detective named Lucy Albright, work day and night to solve the mysteries behind their serial killer and determine if there's a link between the killings, the Eight, and their enigmatic Savior in the sky.