After an embezzling accountant leaves her penniless, ex-model Maddie Hayes decides to sell the few failing businesses she still owns, among them a detective agency. But private eye David Addison wants to keeps his job, so he persuades a reluctant Maddie to form a partnership. Their first case gives them little to go on: Maddie gets a broken watch from a dying man.
Dave and Maddie face a difficult situation when they have to tell their client that the son he hired them to find is a notorious contract killer.
Maddie believes that a client's design secrets are being pilfered from the astral plane by a psychic.
Maddie becomes infatuated with a radio talk-show host who has apparently been murdered while he was on the air.
Maddie and Dave get trapped on a train filled with mystery buffs when they try to deliver Agnes on time for her big weekend solving a make-believe murder staged by a famous author.
Dave and Maddie find a dead body as they try to collect money for a collection agency, but it disappears without a trace when they try to report it.
Dave's older brother shows up unexpectedly, flashing a big roll of money and determined to impress a bemused Maddie, unaware that he's pursued by a drug dealer who wants his money back.
A mysterious veiled woman asks Dave and Maddie to find the man who disfigured her twenty years ago on her wedding day-so she can marry him.
Maddie learns through the near-suicide of a friend where her embezzling accountant has fled to and immediately flies after him, determined to get her money back.
Dave and Maddie each dream their own solutions to an unsolved 1946 murder case after hearing the story while finishing an investigation.
Maddie bets David that he can't act like a mature responsible professional for one full week while they deliver ransom money for the mother of a kidnapped concert pianist.
Maddie fears David's old flame is using him when she returns and asks him for help with a bad marriage.
Dave and Maddie argue over whether to help a young woman who claims to be a leprechaun find the pot of gold she insists her father has hidden for her in Los Angeles.
Maddie becomes obsessed by the portrait done of her by an artist she never knew and who killed himself upon completing it.
Dave busies himself finding an important phone index for a hapless young executive while Maddie mulls over an offer to sell the agency to a competitor.
Ms. Dipesto finds a baby left in her apartment by a woman named Mary fleeing from the hit men who killed her husband, and Dave and Maddie quarrel over using the agency phones as a "Santa hot line."
Dave and Maddie compete to fulfill their client's unusual request: find him a possible mate fitting his very specific requirements.
A restless Ms. Dipesto gets a chance for danger and excitement when she gets a piece of paper from a mysterious man while attending a ball in Dave and Maddie's place.
Dave and Maddie agree to "corpse-sit" for an escape artist's widow, who believes her dead husband's threats to come back and get even with her.
Maddie worries about her parents' strange behavior, so Dave tails her father to see if he's having an affair.
A sick old man asks Dave and Maddie to be the "expert" witnesses at his murder.
Dave uses information passed on to him from a prostitute with an important client who talks in his sleep to solve several big cases.
A depressed man hires a hit man to kill him after his wife dies, then desperately seeks Dave and Maddie's help to call him off when he sees his supposedly dead wife alive.
Dave hires an unlucky con woman who accidentally became a heroine when she stopped an assassination attempt against a United States senator, but who is still pursued by a determined crooked cop.
David's estranged father makes a surprise visit to announce his upcoming wedding and to introduce his bride-to-be, who comes as a shock to David.
A man hires Dave and Maddie to find his wife, who's been making mysterious late night phone calls to him, the same wife he's sure he killed and buried in the forest.
Dave and Maddie agree to each arrange what they consider to be an ideal evening for the other, but the concert tickets Dave buys from a scalper get them into nothing but trouble.
Dave and Maddie are hired by a married woman to find the man she has been sharing a torrid romantic correspondence with and make sure he understands the arrangement is over.
A priest asks Dave and Maddie to find a woman he's become infatuated with during confession and whose latest revelation was her intention to kill herself.
Maddie becomes consumed with curiosity when David announces he must fly back to New York to attend the funeral of his former wife's brother.
A boy hoping to watch Moonlighting but forced to study Shakespeare instead daydreams about the cast performing their own version of The Taming of the Shrew complete with Petruchio Dave and Kate Maddie.
A depressed Maddie gets a chance to see what her life and the rest of Blue Moon staff would be like if she had sold the agency as she originally intended.
Rona Barrett investigates the rumors about discord among the principals at the Blue Moon Detective agency.
Ms. Dipesto tries to solve a haunted house case refused by Dave and Maddie to show Bert Viola that she's just as good a detective as he is.
Maddie's strange mood has David worried so he spends the evening following her, but ends up involved in a murder.
Dave and Maddie quarrel over Sam as they keep watch on a man for his mistress, who's convinced he's two-timing her-with his wife.
Maddie feels more and more confused about Sam and Dave after an all-night stakeout with Dave ends in an early morning proposal from Sam.
Sam confronts Dave about Maddie, and tells him he's not good enough for her.
Maddie tries to ignore the previous night as she and David tackle a new case: a woman wants evidence that her fiance loves her and not her father's money.
After a month of intimacy, Maddie begins to question just where this relationship with David is headed.
With Maddie in Chicago, Dave feels very sympatico with a client who offers $10,000 if they can locate the woman he spent one memorable night with.
David recruits Bert Viola as his detecting companion in a case concerning a man who failed to show up for his wedding while Maddie continues to brood in Chicago.
Maddie's parents throw a party for her in Chicago while Dave and Bert party it up in LA.
Ms. Dipesto lets Maddie's secret slip, so Dave frantically tries to fly to Chicago, but he gets waylaid and makes an unexpected side trip to prison under another man's name.
Mr. Hayes visits Dave after his return to the agency to subtly hint that he should take some responsibility for Maddie's unborn child.
Ms. Dipesto's mother returns from a visit to Mexico carrying more than she realizes and becomes the target for several different parties.
Dave searches for a suitable Lamaze partner so he can be prepared for Maddie's delivery.
Maddie returns to Los Angeles by train and spends the time daydreaming about her future and pouring her troubles out to a sympathetic fellow passenger.
Dave is skeptical about the existence of Walter Bishop and bugs Maddie about it as they work on case for a woman who wants to buy off her husband's mistress.
Maddie's confused and worried: Dave has insisted on throwing a bachelor party for Walter and a huge formal wedding for her.
Bert, bored on an all-night stakeout, dreams about how nice it would be to live with Agnes, but her hesitation when he actually asks her hurts his tender ego.
Dave and Maddie try to recover their working relationship while dealing with the romantic writings of a man obsessed by one woman.
An angel from above visits Baby Hayes as he waits to be born and gives him the low down on his parents and their relationship.
Maddie takes on several new cases in an effort to bury her sorrow, including one where a woman is convinced that her husband is still in love with someone from his past.
Maddie and David struggle to find a new footing for their relationship while working on a case for a woman whose husband of one week returns after a ten year absence.
Maddie and David are hired by a disfigured man who has become a recluse and needs the detectives' help in proving that a plastic surgeon wantonly caused his disfiguration.
The office divides along gender lines when Maddie takes on a case for a woman who shot her boss for sabotaging her career when she refused his sexual advances.
A ruthless divorce lawyer comes to Blue Moon for help in reconciling a couple she helped split up, and Maddie tries to buy David a present.
Dave and Maddie keep company with a popular corpse and visit a graveyard when a man seeking a bodyguard drops dead in their office.
Maddie is sympathetic while David is skeptical when his brother shows up asking for help tracking down his fiancee's former partner, who has absconded with all their company assets.
Maddie resists, but David plunges ahead when a dying burglar asks for their help in proving he committed the perfect crime 25 years earlier.
David goes beyond the call of duty to help entertain Maddie's cousin Annie, and Maddie realizes that David may be over his obsession with her.
Agnes misses Herbert's family reunion when she is called for jury duty. She is the only juror convinced of the defendant's innocence, and the jury is now sequestered until a verdict can be agreed. Herbert is desperate to ensure that Agnes makes it to the reunion so sets out to solve the case himself.
Maddie witnesses a murder and is placed under police protection, but David thinks her bodyguard is crooked and is planning to kill her himself. Annie moves in with David, largely because of the discomfort their relationship is causing Maddie. David goes to Maddie's house to convince her to try to flee from the bad guys, only for a SWAT team to show up and severely damage the house.
Dave breaks it off with Annie when her husband comes to California, everyone attends the wedding of Burt and Agnes, and the agency closes its doors for a final time as everyone tries to figure out why it all had to end.
