Dick is an ambitious American psychiatrist vacationing on the French Riviera with his family. He commands the attention of the expatriate social circle through his charisma and carefully orchestrated dinner parties. Deeply invested in his profession, he maintains his medical background while managing his heavy social responsibilities. He often suppresses his own emotional needs to project a perfectly composed exterior for his guests and his wife.

Nicole is a wealthy American expatriate known for her elegance and striking beauty. She co-hosts social gatherings at the Villa Diana alongside her husband. Beneath her glamorous exterior, she manages a fragile mental condition stemming from severe past trauma. She relies heavily on her husband for stability but possesses a sharp, watchful intelligence of her own.

Rosemary is a 17-year-old American film star enjoying newfound fame after starring in the movie "Daddy's Girl." She vacations on the Riviera with her mother to recover her health. Innocent yet eager for mature experiences, she views the expatriate community through a lens of deep idealism. She quickly fixates on the Divers, particularly Dick, projecting her romantic fantasies onto their lives.

Abe is an American musician and expatriate who spends his days drinking heavily in Europe. He provides a cynical, weary counterpoint to the sunny Riviera atmosphere. His substance abuse frequently pulls him into chaotic situations and bitter disputes with other tourists.

Franz is a Swiss psychiatrist who practices medicine in Zurich. He represents the traditional, pragmatic side of the psychiatric field. He values steady professional advancement and maintains strict boundaries between his personal life and his patients.

Tommy is a French-American soldier of fortune who frequents the Divers' social circle. He approaches life with a blunt, aggressive cynicism and openly disdains the artificial pleasantries of expatriate society. He makes no secret of his attraction to his friends' wives and frequently instigates conflict.

Mrs. Speers is a twice-widowed American woman traveling through Europe with her daughter. She manages her daughter's early career and social life with a practical, open-minded approach. She actively encourages her daughter's romantic pursuits as a necessary part of growing up.

Beth is a wealthy American heiress who monitors her family's international affairs. She uses her financial leverage to control the people around her. She remains perpetually skeptical of the medical care her sister receives.

Mary is the patient, agreeable wife of a troubled American musician. She attempts to maintain a sense of normalcy despite her husband's public intoxication and chaotic behavior.

Albert is an aspiring, unpublished novelist vacationing on the Riviera. He struggles with severe insecurity regarding his literary talent and his marriage. His nervous posturing eventually forces him into a dangerous physical confrontation.

Violet is an American tourist whose desire to fit in leads her to gossip recklessly. Her habit of eavesdropping and spreading rumors deeply offends the more established expatriates at the hotel.

Devereux is a wealthy American patriarch from Chicago. He travels to Switzerland seeking urgent psychiatric help for his youngest daughter. He utilizes his massive fortune to secure exclusive medical care, harboring deep anxieties regarding his family's reputation.

Luis is a highly emotional American tourist visiting the Riviera. He closely monitors the social drama around the hotel and frequently breaks down over his own private romantic failures.

Royal is a flamboyant member of the American tourist group staying near Cannes. He views the expatriate gatherings as the height of sophisticated culture.

Earl is an American film producer working on location in Monte Carlo. He represents the busy, commercial world of Hollywood that contrasts with the idle relaxation of the Riviera.

Collis is a young American student from Yale traveling through Europe. He represents the conventional, youthful American society left behind by the expatriates.

Dr. Dohmler is the veteran director of a psychiatric clinic in Switzerland. He oversees the early diagnostic processes for wealthy international clients and establishes the boundaries for his young medical staff.

Kaethe is the quiet but highly observant wife of a Swiss psychiatrist. She forms strong, critical opinions about the Americans who visit her husband's clinic.

Lanier is the young son of the Divers. He grows up entirely within the wealthy, insulated environment of the European expatriate community.

Topsy is the young daughter of the Divers. She travels frequently to the hotels and villas of Europe alongside her parents.