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.

After Brett loses seven days, Danny thinks Brett is acting strange but Brett thinks someone is impersonating him. They both can't be right.

Danny has to go on the run from enemy agents after his gambling winnings at a Brighton casino turn out to be part of a communist plot to pay off spies when they use the right code words.

It seems that everyone including a former Nazi wants a German Eagle statuette, and they think that Danny is the one who has it.

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.

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.

Danny buys a `handy man's special' cottage in England and discovers that his neighbors are into the occult.

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's relatives are being killed off one by one, so Brett and Danny decide to find the killer before he gets to Brett.

To retain the family jewels, an elderly Russian duchess must present proof of her marriage into the Russian Royal Family, which she says she can do with the help of a journal kept by one of Brett's uncles.