Slate Shannon, an American expatriate living in Trinidad, runs a hotel and travels in a boat called Bold Venture. He cares a ward named Sailor, the daughter of a late friend. Shannon is a detective and deals with baffling cases. Slate Shannon is commissioned to transfer unidentified cargo from a Caribbean steamer to Jamaica in his sloop "Bold Venture". He and Sailor witness a murder before they learn the nature of the mysterious cargo- contraband guns. The gunrunners plan on forcing Shannon and Sailor to land the guns and then kill the couple.
A thug ransacks Shannon's boat, kills a girl and kidnaps Shannon's ward while searching frantically for the figurine of a Chinese Goddess.
Slate becomes involved with three Brazilian dancers who work a pearl-smuggling racket into their act.
A matador is killed in a "game" organised by Slate at the Trinidad hotel.
A beautiful woman, former friend of Slate, visits Trinidad and frames him with the murder of her husband.
Beautiful girl boards a gambling ship against her father's wishes, Slate and Sailor go to the ship to bring her home.
Sailor buys a painting from an island artist. Alma Ross, an American in Trinidad, claims the subject of the picture is her ship-captain fiance -supposedly killed in a steamship explosion.
When Slate and Sailor find four dead men in a drifting lifeboat they learn that the boat is from a ship believed lost in the Far East. Later they learn gunrunners are after them.
An avenging widower plans to murder Slate, but kills the wrong man in Slate's Trinidad hotel.
Jan Viborg, a criminal, makes a false affidavit, which causes the British authorities to revoke Sailor's visa. Slate Shannon saves his ward Sailor Duval from a frame-up. Slate needs maps to clear Sailor of theft charges. By signing a false deposition, thug Ian Vilborg frames Sailor in a theft. He tells Shannon he will retract the deposition only if he steals an aluminum company maps of Caribbean bauxite deposits. Shannon gets the maps, finds himself in a bigger jam than Sailor’s.
Slate and Sailor's picnic on the beach is disrupted by the discovery of a murdered man. Mike Elliot claims that his partner drowned during a sponge-fishing expedition - but Slate Shannon smells trouble when he sees the man, dry and alive.
Shannon receives a note telling him that he is to be killed and then finds one of his guests murdered. Was it a mistake? Death writes an obituary for the wrong man.
When Amy Fonda commits murder in Florida, her sister Liz tries to protect her by hiring a private detective to get the incriminating murder gun. The detective keeps the gun and turns blackmailer.
Stolen diamonds bring two killers to Shannon s Place. The pair of thugs have trailed a man to Shannon’s Place. They shoot to kill for two diamonds known as the Tears of Siva they think the man has in his possession. They discover otherwise and deduce that Shannon has them. Shannon tries to outwit them.
A man is murdered on his wedding day, and his friends decided to deal with the killer themselves
Johnny Sung was a Chinese boy who won a lottery. Later Johnny Sung is murdered and evidence points to his lawyer.
When Slate warns a gang boss that a hired killer will murder him, he endangers his own and Sailor's life and unwittingly gives a wrong picture of the situation.
Slate Shannon aids Jaime Kent, a wounded gangster, and hides him from his double-crossing pals.
An art addict steals a priceless antique, then frames another man for the theft. Slate leads the crook into believing that the detective has found the famed feathered cape of Montezuma.
A beautiful woman poses as a plantation owner's widow to pocket the inheritance. Shannon attempts to catch a widow and her murdering partner. A thug hired by a ruthless woman to kill her husband slays the wrong man. Slate Shannon desperately hunts the pair.
An ambitious general tries to frame Slate for the murder of a visiting prince, whose wife was a Miami showgirl. Shannon flouts the visiting prince and in return faces a murder rap
A dying man is murdered by one of three people. The rich man makes a $5,000 gamble with death.
Slate Shannon matches wits with a vengeful extortionist who has kidnaped a multimillionaire’s son.
A Trinidad fisherman makes a strange catch - smuggled morphine. Canned Tuna - Shannon sets out to solve the murder of a fisherman who found morphine hidden in tuna cans.
The police chase Shannon when they find his photo in the cold grasp of a murdered widow. Working fast to prove his innocence, Shannon uncovers a grim plot. The widow's husband is still alive and in a conspiracy with the head of the lonely-hearts club to live off the murdered widow's estate.
The police chase Shannon (Bold Venture) when they find his photo in the cold grasp of a murdered widow. Working fast to prove his innocence. Shannon uncovers a grim plot. The widow's husband is actually still alive and in a conspiracy with the head of the lonely hearts club lo live off the murdered widow's estate.
An island merchant dies protecting his million-dollar possession, the jewel-covered skull of an ancient Aztec emperor Shannon baits a trap for the thieves, and waits for his prey to bite.
A tourist from Iowa goes on a spree in Trinidad.
Shannon heads for Maracaibo where an oil well he owns in partnership with two other men reportedly strikes oil.
A light-hearted story about a blonde Hollywood starlet, her no-good husband, and a murder where the body kept disappearing.
Shannon finds a trail of jealousy and murder when he searches for an international playboy's missing fiancee.
Slate Shannon is hired by Roberta London, a wealthy woman, to locate and return her errant husband.
Shannon finds himself contending with insurance racketeers when Sailor is informed that she is the beneficiary of her "dead husband's" $50,000 policy.
A thug gun-prods Shannon into walking into a murder set-up.
An ex-prisoner of war comes to Trinidad on a mission of revenge for the years he spent in a Korean war camp.
Niko Kazantos, a notorious crook, tricks Ines, a frightened woman, into believing that she is a murderer.
Slate Shannon comes to grips with a triple murderer who nearly escapes being convicted for his crimes.
Slate acts, quickly and heroically to clear Pepe a prize fighter who has been framed for murder, by his wife , Rita, and Charlie Neal, his manager. The fighter’s wife and his grasping manager are in cahoots.
Slate Shannon becomes a partner in a plan to give asylum in Venezuela to Elena Juarez, a beautiful refugee.