A struggling comedian owes money to the owner of a nightclub. When his body is discovered at the bottom of a cliff in a car crash, all the clues point to suicide. It is later discovered that the comedian was also a police informant on a drug ring he infiltrated at his nightclub. Frank steps in and takes the place of the deceased at the nightclub in order to gather more clues.
The mob sets up an "insurance" scam that threatens several businesses and residents. Frank and Nordberg go to investigate. After a dance instructor is beaten up, they set up their own shop - a key-making and locksmith store - and go undercover. When the mob stops by to offer them "insurance", Frank dismisses their threats and the mob strikes their store. Frank ends up having the key to stopping the crime wave, largely because of the key-making and locksmith shop he and Nordberg set up.
Frank investigates a district judge's courtroom after it is booby-trapped with a powerful explosive. The main suspect is a recently paroled ex-convict with a history of similar bombings. Upon questioning the bomber's ex-wife, Frank and Ed find she's more interested in getting charity than the fact that her ex-husband may be up to his old tricks. Frank and Ed discover the bomber has a showgirl girlfriend on the side. She has the perfect alibi for her boyfriend, but Frank and Ed wonder if she's really just covering for him.
The daughter of a wealthy business man is kidnapped on her 18th birthday and Police Squad swings into action. The main suspect of their investigation is the girl's boyfriend. When Frank and Ed listen to a recording of the kidnapper's demands, they hear the distinct sound of a tuba in the background, though it could also be a ship's horn. They search for a tuba store. When they do track down and find the kidnapper, the criminal fights back.
Frank investigates a veteran boxer who lately has been throwing his fights. He takes the boxer under his wing in order to expose the boxer's corrupt manager. Unfortunately, the manger has kidnapped the boxer's girlfriend and put the boxer's title fight in jeopardy. Frank now tries to save the boxer's girlfriend in the hopes that the boxer won't have to throw the match so he can have a shot at rejuvenating his career in the ring.
Sally, a bank teller deeply in debt, robs her own bank and plants evidence that implicates a fairly commonplace man who was present during the crime. Police Squad, a special unit of the police force, is called to investigate a double shooting that happened during the robbery. However, the stories just don't add up. The evidence builds and points in Sally's direction, but it's up to Frank to find the clues that will put her away.
Smiley interrogates a diplomat by showing him a series of photographs, and in turn, closes in on the person who killed Vladimir. He is lead to the asylum, and ironically, things eventually become clearer.
Smiley and his co-workers read through an extremely long deathbed confession. Using an undercover name, Smiley travels to Berne to attempt to find the missing pieces of the murder mystery. Meanwhile, we are introduced to a woman in an asylum.
Smiley continues his investigation, now looking for a man named Otto in a small fishing community, only to find his decaying body in his boat, and a mysterious chalk mark he's seen before. Smiley talks to the now-perpetually afraid woman.
The investigation of Vladimir's murder leads Smiley to interrogate his latest suspect. Smiley is told to stop investigating the case by a man on a motorcycle, and he just blows him off. Smiley's next stop is Oxfordshire, soeaking to a mother and a daughter about the case.
Smiley takes a trip to investigate his friend's flat for clues. After finding a series of clues that lead to something bigger, Smiley interrogates a man about Vladimir's whereabouts. And lastly, a picture of two men in bed with a woman stirs things up.
Jim is forced to back down about exposing bribery used to obtain a lucrative foreign contract when Bernard allows a valuable vase from a foreign government to be undervalued so that Mrs Hacker can keep it.
Mack\'s father Pete comes to visit him. Pete says he wants to make up with Mac, but then tells him he\'s dying, and doesn\'t want to linger, so he wants Mac to promise to pull the plug. This makes Mac mad, and he tells Karen that Pete cheated on his mother and was physically abusive to him and his sister Megan. Later, Mac decides to give Pete a chance and they hug. Chip wants Ciji to sign a contract giving him 25% of her earnings. Karen throws a benefit party in the cul-de-sac. Chip has Ciji sing at the party. Diana, recuperating, watches the party out of her window, and sees Chip and Ciji kissing.
C&L are assigned to work for Sgt. Dory McKenna on a murder investigation. The baddy is a slumlord who is trying to get rid of his tenants so he can make a co-op out of his building. The kicker is that Dory is using cocaine. After he snorts up at Mary Beth\'s and doesn\'t show up as backup, Chris threatens to turn him in unless he gets help for his addiction.
George\'s investment advice for Tom proves fruitful and puts Helen in a fur coat. This prompts Florence to want to make some money so she asks George for advice. However, since she doesn\'t have enough money for investing, he suggests she go in on the venture with the other maids in the building. The results of the ordeal prove to be less that satisfying, for George anyway.
The search continues for the source of the Legionnaire\'s Disease; Cavanero befriends a young woman facing a hysterectomy; Tweety makes a decision about her future; and Ellen Craig deals with the elusive Dr. Barnum.
Documentary about the little known Yugoslav-American scientist Nikola Tesla, whose experiments with electricity and wireless foreshadowed the discoveries of Edison and Marconi. Some of his most spectacular experiments are recreated by the programme\'s presenter Robert Syme.
A Christmas episode, lighter than usual. The \"\"villain\"\" is a nebbish who steals from parking meters. When he gets arrested, he makes off with a squad car, which so enrages Samuels that nobody gets to leave early on Christmas Eve. The villain is played by character actor David Masur The \"\"B\"\" story is that Petri\'s Lauren daughter is born. We first meet Dory McKenna as Chris\' boyfriend.
Saving a teenage girl high on drugs from jumping off the high-school roof, Hooker is concerned that there is a new supplier of PCP on the streets that is dealing to the students. When a rookie officer is badly wounded while undercover trying to stop the suppliers, Hooker is determined to get to the root of the operation and put the dealers behind bars...
Laura and Ciji become friends and spend time together. It\'s Ciji\'s 25th birthday and Chip calls and says he\'s hung up at work, so Laura gets her a cake. Kenny hears rumors that Jeff is taking over their record label, but Gary assures him it\'s not true. Abby refuses to donate her kidney at first, but then decides to after talking to Diana. Karen thanks her but Abby says she\'s doing it for Sid and Diana, NOT for her. Chip gives Diana the necklace he bought for Ciji\'s birthday and tells her he loves her. Surgery goes fine and both Diana and Abby are okay. Karen goes into Abby\'s room while she\'s sleeping and kisses her on the forehead.
Michael Moroshima, a cop working undercover with the Asian task force and Sam\'s best friend, is killed while listening in on a deal between the Yakuza and the Mafia. Sam explains to Quincy all about the Yakuza and the Japanese code of honor that means his friend\'s father will try to find his son\'s killer and exact revenge. Sam tries to prevent this from happening but finds himself getting into deeper trouble himself.
When Heather asks Santa to patch up the rift between her mother and grandparents, Fonzie decides to make her wish come true. Meanwhile, K. C.\'s parents visit for Christmas, and a rivalry between Howard and his brother reignites.
Dr. Westphall risks his job by creating an isolation floor to stem the spread of the suspected Legionnaire\'s Disease (and the PR fiasco causes administrator Cummings to fall on his sword to save the hospital); Dr. Beale learns that Tweety got pregnant while in the hospital; Fiscus is assaulted in the E.R.; and Dr. Craig decides to sell his car.
Dick praises an aspiring writer\'s work to avoid hurting her feelings. The writer\'s enthusiastic husband quits his job to allow his wife to write full time. It\'s up to Dick to secure her an agent and teach her to write, all before their savings runs out in a month and a half.
C&L and another detective are working on a case involving some illegal weapons. The catch is that the third detective has just had his picture turn up in a gay magazine. Is he gay? Will he be suspended before he helps C&L catch the bad guy?
In \"\"The Kleptomaniac\"\" A kleptomaniac comes to the Island to rid himself of the urge to steal. Tattoo is asked to keep a constant eye on Fred Simpson, but to no avail!\n\nAnd in \"\"Thank God, I\'m A Country Girl\"\" A waitress wants to appear to be a wealthy heiress for a daughter she gave up for adoption as a baby.
Jeff Munson tells Abby he\'d only work with Ciji if he produces her. Abby says not to worry - she won\'t let Kenny stand in their way. Ginger shows Kenny a song she wrote, and when Ciji sings it that night at Daniel, Ginger is furious. She yells at Ciji that it is HER song, and she will get Ciji for this. Diana collapses and needs a kidney transplant. Karen doesn\'t handle it well, and the boys ask Mac to come to the hospital to support her. Karen rejects him at first, but then lets him comfort her. Karen and the boys don\'t match Diana\'s blood type, and therefore can\'t donate their kidneys. Karen asks Abby to be tested.