An assassin critically wounds a visiting dignitary and Stone and Briggs must thwart the killer's plan to finish the job.
Stone goes undercover to catch a gang of counterfeiters but his cover is soon blown.
The squad entertains a visitor from Scotland Yard, Inspector Murchison, who's trailing jewel thief Dandy Phelps. What they don't know is that the real Murchison was murdered upon arriving at the airport, and that their guest is really Harry Wade, Phelps' double-crossed partner, who's out to gain sole control of the stolen jewels.
Sam and Jim keep close watch on a playboy pharmaceutical salesman and his timid buddy, whom they suspect in a theft and murder at a drug laboratory.
The critically injured survivor of an auto accident has a bag with a huge sum of money in his possession, and Sam suspects that he's a syndicate courier. When thugs threaten to kill the man's family unless they get their money, Jim poses as the courier to complete the delivery.
Sam persuades Terry Carew, a former football star turned pitiful junkie, to help him nail pusher Braden.
A player in a poker game aboard a yacht bets his life and loses, and Jim and a policewoman pose as high rollers to enter the game and nail the killers.
Sam's suspicions are aroused when a hit-and-run driver returns to the scene of the crime to confess, but no body can be found.
A beautiful woman disappears before she is to give a damning testimony against racketeer Arnie Kale in a murder trial, and Sam and Jim suspect that she has been lured into a trap.
Sam reacquaints himself with an old girlfriend, whose charming but troubled brother is involved in a jewel theft and murder.
A boy tells Sam that his mother, a nurse, got lost while they were playing hide-and-seek, and a subsequent investigation reveals that she's been kidnapped by a deranged country singer who wants her to treat his critically wounded wife.
Sam and Jim aid a department store manager whose wife and son were kidnapped after a robbery went awry.
Sam and Jim travel to Central America to bring back deposed syndicate chieftain Stengl so he can testify against his successor and brother-in-law Luther, but unwittingly walks into an ambush.
While traveling back to the states with Stengl, Luther's men take Dan and Stengl's comatose daughter hostage.
Sam and Jim witness a boat explosion that killed a veteran cop, but their suspicions are fueled when no body can be found, and it's also discovered that the dead man was working as a private operative for an old friend who's being blackmailed.
Sam and Jim must pursue a harried executive who flew into a murderous rage after discovering his wife's affair with a tennis instructor.
Sam and small town Sheriff Cal Cable pursue the same girl for different reasons, Sam needs her testimony to convict mob boss Gus Mills for murder, while the corrupt sheriff wants to silence her.
The body of the manager of singer Julie Brown washes up on the beach, and Sam and Jim take on ruthless record executive Ollie Olds, who is out to sign the young singer to a contract.
Jim's concern for Julie almost costs him his life, and he and Sam must prove that Olds is trying to control her through massive doses of LSD.
A beautiful but naive heiress is led to believe that a potential suitor wants to elope with her, unaware that he's really a kidnapper out for a big payday. Her rich and powerful father hinders the investigation by trying to handle the situation without the cops.
Sam and another cop are ambushed while transporting a witness, and the witness is kidnapped. While Sam is recovering in the hospital, Jim and Dan pursue the abductors who want their hostage, a reformed safecracker to assist them in a burglary.
Three attempts on Jim's life have him in hiding while Sam and Dan try to figure out why mob boss Cal Wolff wants the young cop dead.
Two murderous brothers are out for revenge against Stone, who killed their other brother years before during a shootout.
A veteran cop dies in a warehouse fire, putting Stone and Briggs on the trail of an arsonist for hire whom they must stop from setting fire to a freighter full of plastic goods.
Suspecting that the bizarre death of a public relations man was no accident, Stone goes head to head with the dead man's ruthless boss, a powerful image maker who sets out to discredit the veteran cop.
Joe Morales, an ex-con whom Sam helped obtain a warehouse job, is suspected of breaking into the safe and killing his new boss, but Sam suspects that the young man was set up.