In Wisconsin, Rhinelander PD attempts to foil a murder for hire by going undecover and meeting the suspect as a hitman. In Colorado, law enforcement from two counties tries to stop a runaway semi-truck before it devastates the little town of Brush.

A suspect swims for freedom, leading cops on a hunt through the mangroves.

In Ohio, officers respond when a man brandishes a knife in a store; in Georgia, police launch a manhunt after a suspect escapes in his truck, leaving an officer down.

Police race to an armed robbery and face a hail of shotgun pellets; a gas explosion lifts the roof off an apartment building, engulfing officers in a fireball; in Georgia, a man fights for his life in a wrecked SUV.

Information leads undercover FBI officers to a plot to murder lawmakers. A Florida man throws himself into alligator-infested waters to evade arrest, and in Phoenix, fire threatens to consume a driver trapped in a wrecked car.

Officers catch burglars in the act, and a house fire traps a woman inside.

Police chase a known criminal through the dangerous Ocala National Forest; in Michigan, a spree of home invasions escalates into a three-day manhunt.

In Florida, a suspect's car going 45 miles per hour, drags a Pembroke Pines PD officer behind it. In Georgia, a domestic dispute turns into a shootout, leaving one officer fighting for his life. In Michigan, a routine traffic stop turns into a car chase.

Police hunt a murder suspect. Officers try to save a couple in an icy lake.

In Ohio, police try to rescue a woman trapped in a sinking car which puts an officer's life in danger. In Florida, a high-speed pursuit ends in a swamp, where the suspect shoots at police and escapes. Specialist units set out to locate the criminal.