Max Keller meets up with John Peter McAllister, an American who having remained in Japan after World War II, became the only occidental American ever to achieve the status of the Ninja. Having returned to America to locate his newly discovered daughter, he agrees to tutor Max in the ninjutsu arts, while helping a father and daughter fend off an unscrupulous land developer who is trying to get a hold of their airport.

After arriving in a coastal down, Max and the Master help a young girl, Kerry, set up a union in the local cannery despite the wishes of the owner.

Max and McCallister get invited to an exclusive political party at an isolated mansion that is taken over by terrorists. The local CIA head is aware of McCallister's past and suspects him of being involved - McCallister must free the hostages to prove his innocence. And Okasa is lurking nearby to complicate matters even further...

On the trail of his daughter in San Francisco, McCallister and Max aid a nightclub owner against a ruthless Chinese syndicate.

A former military squad turns to crime and plans a casino heist, and needs the inside help of a dancer - they kidnap her daughter to get it.

The Master must make his way past a booby-trapped cave in Hawaii to recover a priceless statue.

Farmers need the help of the Master and pupil to get their goods to market past a trucking firm's roadblock.

When a secretary is kidnapped, Max and the Master get involved. The secretary works for Max's negligent, drunk father, and they must protect a blind woman who the kidnappers believe is a witness to their crime.

McCallister is framed for murder by an old ""friend.""

The Master takes on a squad of rogue cops using their training and positions to commit a series of robberies.

McCallister and Max come to the aid of a reporter doing an expose on ruthless gunrunners.

To rescue a woman claiming to be the Master's daughter, Max and the Master end up having to steal the British Crown Jewels.

The Master and Max take on a ruthless land developer who is trying to evict a woman and the orphans she takes care of from their property.