An assassination plot is revealed in the course of Mannix's investigation.

A skyscraper burglary leavs Mannix and a pal in a fix.

Old friend dies on a mob run, they suspect Mannix.

Soviet agents want Marx's manuscript of Das Kapital, and a young woman has just inherited part of it.

Mannix takes the case of a muder victim in a photograph.

Mannix tracks down stolen jewels also wanted by a blind hood.

Threats prevent the discovery of a murder.

On an island off the South American coast, Mannix seeks out the rescuer of a client's son.

A Hollywood murder may have been a mistake.

A Nazi Party figure turns up in the routine investigation of a helicopter crash.

A soft case with plush lining gives Mannix cause for uneasiness.

An unsolved murder and an author with enemies.

Mannix enters a race in which a driver is killed.

Japanese consular matters entail a private eye and Mannix's cooperation

A little girl is the key to a murder.

An actress claims a bizarre murder attempt.

A colleague's murder leaves an open casebook.

An opera diva emerges from retirement and is met with inexplicable attempts on her life.

Political blackmail turns to mischief when the blackmailer is found to be long dead.

A cop under suspicion goes missing.

On a helicopter trip, Mannix thinks he sees a murder being committed.

A chance meeting between two Vietnam veterans proves fatal for one of them after they are spotted by a third buddy, a deserter who has no intention of being turned in.

Small town rules may include murder.

A street gang plots to do Mannix in to make a name for itself.

The vortex of the paranoid: Mannix is threatened and framed.

A double set-up puts Lt. Malcolm behind bars.

A blackmail victim is headed for prison.

An old foe's girlfriend dies suspiciously.

An accidental drowning has many surprising facets.

A scientist goes missing with a new formula.

A psychiatrist who treats sociopaths is supposed to have committed suicide.

His wife says somebody else came back from the crash.

A hit-and-run case lands Mannix in the middle of a gang war.

An escaped convict saves Mannix's life.

The two paths of the case meet at the water's edge.

The strong friendship between Lew Wickersham and Mannix melts into a violent and deathly feud. The bitter battle begins when Mannix launches an investigation into the theft of a highly secret formula for the development of a laser ray. Stolen plans and sabotage involve Intertect and their agents.

A girl disappears, and Mannix investigates her Vegas connection.

Death row inmates force a case to be investigated.

Mannix has an enemy who seems to be dead.

An acquaintance from Korean War days has a bone to pick.

Mannix is set up for the murder of an old girlfriend's husband.

A dead ex-con has Mannix's name on him.

A kidnapping case suddenly emerges from the files.

A colleague on the shady side of the street is killed.

Murder on the rock circuit.

In possession of a piece of evidence, Mannix is shot and left for dead.

A plane crash is followed by murder attempts.

A trail of evidence indicates a friend of Peggy's.

Undercover in New Orleans.

An African Premier is in the hospital incognito, where Peggy is laid up with on-the-job injuries.

The strange utterances of a disturbed young girl are clues in a case of robbery and murder.

Mannix tries to locate an heir, who is brought into danger by the attention.

An old pal asks Mannix for help; when he arrives at the man's rural town, there's murder afoot.

Mannix finds new evidence in the case of an embezzler he sent up the river.

A psychopath's next victim might be his wife.

Hired and fired, Mannix pursues a missing person.

A newspaper publisher's daughter is implicated in the death of a mobster.

A faith healer gets blackmailed.

A triangle in academia.

Evidence rules out one confession, indicates another.

A gang boss engineers a deceptive getaway.

A big kidnapping plot and an insignificant victim.

A colleague's death leads Mannix into a dubious investigation.

A varsity basketball player vanishes strangely, and is sought curiously.

A colleague's death leaves Mannix with the evidence he was murdered for.

A boastful nemesis takes Peggy for bait.

Disappearing enemies and friends force Mannix into a blackmail investigation.

Joe Mannix receives an urgent letter from a woman named Lynn Sargent asking him to fly to Arizona. She meets him at the airport and hands him a check for $1,000 and a small sealed package, telling him the money is his fee to take the package to the Los Angeles Police Department. Just as she does so, two men try to take the package, but Mannix manages to retain it after a scuffle. But the mystery deepens when the package turns out to contain nothing but blank sheets of paper -- and the police chief in the town tells Mannix that Lynn Sargent died a month earlier in a hit-and-run accident.

A court-martialed soldier has plans for revenge.

Mannix cooperates in a police investigation.

An undercover cop's murder exposes a vice operation.

An injured client disappears.

A doctor's son is kidnapped to force a failed surgery.

A threatened cop is in need of protection.

A policeman's son is suspected in a robbery.

A missing million leads Mannix out of Intertect as bait for a drug ring.

A priest's vows give a murderer a second chance.

Mannix is up to his private investigator's license in trouble, when a surprising source offers help.

Mannix is poisoned, and only the poisoner knows how.

A missing boy and a cover-up.

A young heir wakes up bloodied and minus a grlfriend.

A amnesiac veteran is up to his stripes in mischief.

Conflicting confessions have to be sifted.

Carnival mishaps may be aimed at the proprietor.

A racing accident lays Mannix up. While recuperating, he hears threats against him, but are they real?

A stolen thoroughbred has Mannix buffaloed.

Mannix has side action on a kidnap case.

Blackmail in the film industry.

Someone keeps missing Mannix, but who's the real target?

Ross and Alex are members of Mannix's college football team who put together an unconventional reunion in a ghost town. The reunion ends in murder and reveals years of deceit and jealousy that come to light in a series of bizarre and morbid.

A dubious client is caught in his own machinations.

Mannix in the middle of a gang war.

A political candidate asks to be vetted.

The death of an inventor raises questions of motive.

A model's suicide proves doubtful.

A widow's husband was a man of mystery.

After her husband commits suicide in Hong Kong, Ellen Gray finds she's being shadowed by a Vietnamese for reasons that neither she nor Mannix can fathom.

Strange circumstances surround an arrest by Mannix.

Bribery money is taken in a robbery.

A murder investigation bumps up against hard evidence.

Someone is out to get a film star.

After an automobile accident, an Olympic diver receives threats.

A serial killer's accounts may have been padded.

Peggy goes undercover to nab a dope ring.

An ex-con's daughter is suspected in murders surrounding the unrecovered loot.

Undercover at a health farm for boozehounds.

Mannix stumbles into a mob plot at a highway cafe.

Scotland Yard is after millions from a robbery, and they're not the only ones.

Mannix reopens a malpractice case against opposition.

Eyewitnesses peg Mannix's client, but the victim isn't what he seems, either.