Nothing good ever happens on Saturday nights. Not in a city the size of Chicago, and not for the detectives of the 18th Precinct. Detective Sam Black and partner Alec Winters respond to a chilling call. A dead body’s been discovered near the lagoon in Lincoln Park Zoo, one of the city’s largest tourist attractions. The Superintendent of police and Mayor are screaming for a quick resolution before the media creates a frenzy.
Sharp twists and unexpected turns force the detectives to put personal animosity aside when another girl goes missing. With the suspect pool quickly eroding, Sam follows a hunch that leads her to the killer’s lair and brings her face to face with a mad man determined to make her his next victim.