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.
Guest Stars:
John Acheson, Imogen Hassall, Alex Scott, Bruno Barnabe, Laurence Naismith
Danny and Brett must discover whether or not Gold Napoleon coins are the originals, or replicas as a coin dealer claims them to be.
Guest Stars:
Alfred Marks, Hugh Manning, Susan George, Laurence Naismith, Harold Goldblatt
Danny and Brett try to help a girl whose ""long lost brother"" has suddenly appeared, cutting her off from her inheritance.
Guest Stars:
Richard Hurndall, Sue Lloyd, Sinéad Cusack, Garfield Morgan, Veronica Hurst
Brett's family mansion seems to have been restored without his knowledge, and taken over by strangers. To find out why, he pretends to be the actor they have hired to impersonate him, and ends up helping the Prime Minister.
Guest Stars:
Clifton Jones, George Woodbridge, Cy Grant, Andrew Keir, Rosemary Nicols
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.
Guest Stars:
John Phillips, Annette Andre, Terence Alexander, Paul Whitsun-Jones, Lionel Blair
Danny runs into political intrigue when he discovers the dead body of a reporter, then can't find it until it turns up in a car crash hours later.
Guest Stars:
Robert Flemyng, Ian Hendry, Geoffrey Toone, Anna Palk, Duncan Lamont
After Brett loses seven days, Danny thinks Brett is acting strange but Brett thinks someone is impersonating him. They both can't be right.
Guest Stars:
Gerald Sim, Johnny Briggs, Bernard Lee, Reginald Marsh, Tony Wright
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.
Guest Stars:
Richard Vernon, Cyd Hayman, Ed Devereaux, Patrick Jordan, Peter Forbes-Robertson
It seems that everyone including a former Nazi wants a German Eagle statuette, and they think that Danny is the one who has it.
Guest Stars:
Juliet Harmer, Patrick Troughton, Frederick Jaeger, Jasmina Hilton, Anna Gaël
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.
Guest Stars:
Lionel Murton, Larry Storch, Laurence Naismith, Kirsten Lindholm, John Alderson
While out camping at Brett's family estate, Danny gets chained to a brief case which he can't get off that contains a bomb.
Guest Stars:
Suzanna Leigh, Peter Vaughan, Jeremy Child, George Baker, Morris Perry
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?
Guest Stars:
Patrick Newell, Juliet Harmer, Terence Edmond, Suzan Farmer, Allan Cuthbertson
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.
Guest Stars:
Glynn Edwards, Valerie Leon, Madeline Smith, Anouska Hempel, Deborah Moore
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.
Guest Stars:
Suzy Kendall, Frank Maher, Stephen Greif, John Orchard, Terry-Thomas
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.
Guest Stars:
June Ritchie, James Cosmo, Carol Cleveland, Peter Bowles, Shane Rimmer
Danny buys a `handy man's special' cottage in England and discovers that his neighbors are into the occult.
Guest Stars:
Leon Greene, Hannah Gordon, Talfryn Thomas, Michael Sheard, John Ronane
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.
Guest Stars:
Ferdy Mayne, Jean Marsh, Joan Collins, Arnold Diamond, Robert Rietti
After Danny is accused of kidnapping his blind date, a rich man's spoiled daughter, Brett and Danny decide to help rescue her from the real kidnappers but have problems keeping her rescued.
Guest Stars:
Ralph Bates, George Murcell, Sarah Lawson, Michael Culver, George Roderick
Brett wakes up one morning and discovers that he got married the night before.
Guest Stars:
Catherine Schell, Tony Bonner, Marianne Stone, Yutte Stensgaard, Griffith Jones
Seeking sanctuary with his old friend Brett is a spy who plans to publish his memoirs, which contain the name of every NATO, SEATO, and ANZUS agent.
Guest Stars:
Nigel Green, William Mervyn, Kate O'Mara, Joss Ackland, George Merritt
Brett's relatives are being killed off one by one, so Brett and Danny decide to find the killer before he gets to Brett.
Guest Stars:
Moultrie Kelsall, Diane Cilento, Denholm Elliott, Roland Culver, William Rushton
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.
Guest Stars:
Joseph Fürst, Gary Raymond, Anouska Hempel, Gladys Cooper, Cyril Shaps
Brett and Danny both end up wooing an heiress after they are asked to break up a romance between a her and a gigolo who is courting her.
Guest Stars:
Terence Morgan, Thorley Walters, Roger Delgado, Jennie Linden, Robert Russell