Old-school cop Dan Stark and modern-day detective Jack Bailey expose the big picture of small crime. Pursuing a routine investigation of a stolen humidifier, Jack and Dan are inadvertently thrust into a much larger case involving drug smugglers, hired assassins and a stolen green golf bag. Reminded of the way he busted punks back in the good old days, Dan convinces Jack to go along for the ride, and in their reckless pursuit of justice, the two wind up risking their lives, breaking a flurry of department regulations and reminding their boss, Lieutenant Ana Ruiz, and Jack's ex-girlfriend, Assistant District Attorney Liz Traynor, why these good guys will be spending many more days investigating seemingly minor crimes.

Dan's police interrogation techniques come back to burn him when it is ruled by the court that his interrogation of a drug smuggler was illegal. As a result, the felon busted by Jack and Dan months before is set free. Without access to any department resources, Dan vows to put away the entire drug smuggling ring with just his pocket money. Along the way, the partners find themselves trapped in a truck full of scented candles, Jack is reprimanded in front of his ex, and Jack and Dan get stuck in the middle of yet another shoot out.

Jack and Dan go off on their own, yet again, after they are assigned to help a forensic specialist with a burglary case. Weary of the specialist's superiority complex, the duo breaks free only to be tangled up in another case entirely. They must get help from an unlikely source to save Liz when she gets in trouble working a high-profile prostitution sting.

Jack and Dan get a tip from a neighborhood kid about a lowlife stealing mail. During the investigation, they come across two identity thieves forging documents for a murderous pair of Mexican drug-runners, killing their way to better lives in America

While following up on a stolen truck investigation, Jack and Dan wind up uncovering a major heist involving a shipment of high-profile diamonds. Meanwhile, tensions rise when Dan discovers Jack is interviewing for a position on an elite police unit.