Dressed as rodeo clowns, two men rob a rodeo. Cannon is summoned to figure out what's going on, after authorities spend six weeks and come up with nothing.

Should the weapons manufacturer be judged by its bookeeper?

Mike Tampa owns a vineyard in northern California... his land alone is worth $2 million, but he loves wine-making and is not considering selling. His father started the vineyards, handed them down to him, and he hopes that his son Johnny Tampa will be the third generation. Mike Tampa, however, has been the victim of three murder attempts—in the last one, his brakes were tampered with, and he barely survived when he took his car down a mountain road.

At this point, his secretary calls on Cannon—secretly, because the stubborn Mike has refused to do anything. Cannon is brought in to investigate. We learn that Johnny Tampa had only been re-united with Mike two years ago... after not having seen him for 20 years (Mike and his wife went through a bitter divorce 22 years prior and she took their son down to San Francisco).

Cannon suspects that Johnny may be pulling a con and that he is not really Mike's son. The winery accountant says that they had Johnny checked out by a PI down in SF n

Keeping your double chin up. A draft dodger winesses a murder on his way to the Yukon.

That was my wife? A lady lawyer gets threatened with death for defending punks who robbed a charity.

Alien-smuggling.

A doctor is accused of drug-dealing.

There's only one way to deal with that: serve equal portions. Freight shipments are stolen by computer, and Cannon's in the middle of a custody fight.

Cannon's engaged to protect a gang boss from the innocent man he sent up the river.

A blackmailer's murder brings his Swiss wife to America, and Cannon discovers still more dealings.

A former general hires former policeman Cannon to investigate his brother's murder.

A big game hunter is killed by a lion supposedly tranquilized.

A banker's daughter finds his suicide in the Caribbean incredible.

A general wants Cannon to find the daughter he put up for adoption years before, but there is opposition to the search.

A Cuban exile wants revenge for his brother's death at the hands of police.

Cannon deals with an insurance company in a suspicious auto accident.

A Dutch Nazi-hunter is on the trail of an SS man.

Cannon reluctantly takes the case of a disappearing bridegroom, but it's more than it appears.

A girl's suspicious death brings Cannon to Texas.

A torpedo plays dead to testify, but the mob sniffs him out.

A case of mistaken identity: Cannon is greeted by a stranger, and later almost killed.

A case of police corruption and the death of a reporter.

The wife of an industrialist is missing, and the search is a difficult one.