Inspector Lohmann's eagerly awaited fishing holiday is put on hold when he is called to investigate the murder of a man found in a railway tunnel. He was an Interpol courier carrying proof of the Chicago Syndicate's planned cooperation with a European criminal organisation that was in an attache case chained to, but now missing from his body. The Inspector gets word from Washington D.C. that a female representative of the Syndicate, Mrs. Pizarro is currently in Europe to meet up with the European criminals, and that the Federal Bureau of Investigation is sending Special Agent Joe Como to liaise with the German authorities. Lohmann visits a prison to have a meeting with one of the prisoners, Alberto Sandro, who was a member of the European criminal organisation in an unsuccessful bid to learn more about the upcoming events.
Diana, a stripper, is electrocuted during a dance routine on stage at the Flamingo Club. Her husband, compere Bert Black, turns detective to investigate. He suspects Diana was murdered for a crime she didn't commit, but proving it to the satisfaction of Inspector Forbes is another matter.
Le racket du catch est exploité par un couple d'aventuriers, le Baron - Ray Rollando - et Ruby la Dorure. Au cours d'un match truqué par les deux compères où s'affrontent « le Masque aux dents blanches », « le Justicier de l'Au-delà » et « le Barbu de l'Arizona », terreur de la Prairie, Slim Callaghan les confond en se substituant au Masque aux dents-blanches. Dupés, le Baron et sa bande jurent de se venger. Slim Callaghan s'oriente alors vers une nouvelle affaire encore plus retentissante, le vol célèbre des diamants de la Haute Sangha. Aidé de sa blonde et jolie secrétaire Carola, Callaghan aborde un luxueux yatch, en Méditerranée. De là, il pénètre dans une somptueuse villa où se donne une soirée travestie .
À Boston, Chips McCann, patron d'une boîte de nuit, forme un commando afin de braquer un fourgon blindé transportant un magot de 2 millions de dollars. Il confie l'opération à Red Mack, attendant alors la sortie de prison de son vieil ami Pop Kane. Quand ce dernier est enfin libéré, les préparatifs du coup débutent et durent plusieurs semaines. Le braquage se déroule à merveille, les voyous portant des masques d'Halloween...
Thomas Lieven vit une vie de banquier à Londres et séduit les dames avec ses talents culinaires. Mais il est poursuivi pendant la Seconde Guerre mondiale comme agent double et triple supposé des services secrets de la Grande-Bretagne, de la France et de l'Allemagne. Avec le colonel Siméon et l'agent française Mimi, il arrive à Toulouse où il reçoit l'ordre d'établir la liste des agents secrets français à Nice. Un courrier lui annoncerait son retour avec en Angleterre.
On January 5, 1900, four friends arrive for a dinner at the house of H. George Wells (Rod Taylor), an inventor. Their host is late and his housekeeper, Mrs. Watchet, has served dinner in his absence. Bedraggled and exhausted, George staggers in. He takes brief refreshment and begins to describe the strange experiences he has had since the last time the group met.
In the early 1930s, Chuck Glover (Montgomery Clift) arrives in Garthville, Tennessee, upstream from a newly constructed hydroelectric dam of the Tennessee Valley Authority, to head the TVA's land purchasing office after its previous supervisor abruptly quit. He has the responsibility for supervising the clearing of land to be flooded but must first acquire Garth Island on the Tennessee River, the last piece of property yet to be sold to the government. The previous supervisor was unable to convince the elderly Ella Garth (Jo Van Fleet), matriarch of a large family that has lived on the island for decades, to sell her land to the government, which to avoid bad publicity the TVA wants to acquire without using force. The clearing of the land for the coming lake is also proceeding behind schedule because the local mayor, the town's barber, uses only white labor. Chuck crosses the ferry to Garth Island but Ella and the other Garth women, including Ella's granddaughter Carol Baldwin (Lee Remick), refuse to listen to him. He tries to reason with Ella's three grown sons, Hamilton (Jay C. Flippen), Cal (James Westerfield), and Joe John, but being relocated means working for a living and they have never worked in their lives. Joe John tosses Chuck into the river. Hamilton comes to Chuck's room soon after to invite him to the island for a formal apology and to speak with Ella.
Hélène Chalmers, fille d’un grand patron d’un groupe américain de presse, arrive à Rome et Ed Dawson, responsable de l’agence italienne, est chargé de l’accueillir. Peu de temps après, Hélène disparaît et son père demande à Ed de la retrouver. Il se lance à sa recherche et se retrouve impliqué dans une ténébreuse affaire.
L'agent du F.B.I Lemmy Caution, qui arrive des États-Unis, et le général Rupert, chef du service français de contre-espionnage, s'occupent de la même affaire : retrouver un espion connu sous le nom de Varley. Malgré sa vivacité, son punch et son goût des boissons fortes, Lemmy sera coiffé au poteau par les services français et, de retour à Washington, pourra tenter de récupérer les fils embrouillés de cette histoire où la propre nièce de Rupert, Martine, était le sosie d'une aventurière et où Girotti, propriétaire d'un bar, n'était autre que le fameux Varley.
A gang of World War II 82nd Airborne veterans is recruited by Danny Ocean (Sinatra) and Jimmy Foster (Lawford) to rob five different Las Vegas casinos (Sahara, Riviera, Wilbur Clark's Desert Inn, Sands and the Flamingo) on a single night.
A washed-up classical pianist, Charlie Kohler/Edouard Saroyan (Charles Aznavour), bottoms out after his wife's suicide — stroking the keys in a Parisian dive bar. The waitress, Lena (Marie Dubois), is falling in love with Charlie, who it turns out is not who he says he is. When his brothers get in trouble with gangsters, Charlie inadvertently gets dragged into the chaos and is forced to rejoin the family he once fled.