A retired judge who regrets those criminals he had to let get away arranges for Brett and Danny to meet, and then gets them arrested so that they have the choice of either helping him out in his fight against crime or staying in jail. Their first assignment is to locate an heiress by her heart-shaped birthmark.

Danny and Brett must discover whether or not Gold Napoleon coins are the originals, or replicas as a coin dealer claims them to be.

Danny and Brett try to help a girl whose ""long lost brother"" has suddenly appeared, cutting her off from her inheritance.

When the Judge tricks Brett and Danny into identifying a dead woman found floating in the waters of the French Riviera, they end up investigating an international stock swindle.

An childhood friend of Danny's from the Bronx turns out to be a hit man hired to kill an American labor leader on holiday at the Cannes Film Festival.

In order to catch a war criminal, Danny must impersonate the kidnapped Brett, but how will he explain an English Lord with a Brooklyn accent?

When Danny and Brett find the decade-old dead body of a scientist in a crashed plane in the Scottish Highlands, several women claiming to be his daughter offer them various inducements to part with the formula they found.

When Brett's plan to capture a traitorous British spy by pretending to be him results in his own capture, Danny enlists the aid of one of Brett's relatives to rescue him.

At a London airport, a gang of crooks who are planning a bullion heist mistake Danny for a criminal mastermind when the man's suitcase accidentally ends up in Danny's luggage cart.

Trying to open a travel business, Danny and Brett encounter a New York hoodlum who needs to be smuggled out of Italy after he killed an Italian gangster.

Brett wakes up one morning and discovers that he got married the night before.