A massive sinkhole mysteriously opens up in Los Angeles, separating part of a family in an unexplainable primeval world, alongside a desperate group of strangers.

A riveting police drama about the men and women of the Chicago Police Department's District 21 who put it all on the line to serve and protect their community. District 21 is made up of two distinctly different groups: the uniformed cops who patrol the beat and go head-to-head with the city's street crimes and the Intelligence Unit that combats the city's major offenses - organized crime, drug trafficking, high profile murders and beyond.

The State's Attorney's dedicated team of prosecutors and investigators navigates heated city politics and controversy head-on, while fearlessly pursuing justice.

After watching their respective partners die, a New Orleans hitman and a Washington, D.C. detective form an alliance in order to bring down their common enemy.