A bump on the head sends Hank Martin, 1912 mechanic, to Arthurian Britain, 528 A.D., where he is befriended by Sir Sagramore le Desirous and gains power by judicious use of technology. He and Alisande, the King's niece, fall in love at first sight, which draws unwelcome attention from her fiancée Sir Lancelot; but worse trouble befalls when Hank meddles in the kingdom's politics.
A popular singer, Marian Washburn, suddenly and unexplainably loses her voice, causing a shake-up at the club where she works. Her worried but loyal piano player, Luke Jordan, helps to promote a new, younger singer, Susan Caldwell, to temporarily replace Marian. Susan finds some early acclaim but decides to leave the club after a few performances. Soon after Susan quits, she is gunned down, and Marian quickly becomes a suspect.
At the turn of the 20th century, travelling salesman Virgil Smith journeys to Vienna in the hope he can sell a gramophone to Emperor Franz Joseph, whose purchase of the recent American invention could spur its popularity in Austria.
Captain Hugh "Bulldog" Drummond is called in to solve the murder of a man from whom two lead soldiers were stolen. Drummond learns that the two soldiers were part of a set of thirteen which formed the key to a hidden vault of treasure. Following some clever sleuthing and set-up on Drummond's part, the guilty man is trapped in the vault,which is hidden behind the fireplace.
When a music-hall dancer is murdered, a moss rose marks the page of a Bible next to her body. Luckily, another chorus girl saw a gentleman leaving the lodgings. She approaches him directly, saying she'll go to the police if he doesn't meet her demands, but he brushes her off contemptuously. When he learns she's dead serious, he tries to buy her off with a thick wad of pound notes. But it's not money she's after; all she wants is two weeks at his country estate, living the life of a lady.
A British peer's romance with a ballerina courts scandal in 1890s London.
London, 1761. St. Mary's of Bethlehem, a sinister madhouse, is visited by wealthy people who enjoy watching the patients confined there as if they were caged animals. Nell Bowen, one of the visitors, is horrified by the deplorable living conditions of the unfortunate inhabitants of this godforsaken place, better known as Bedlam.
When composer George Harvey Bone wakes with no memory of the previous night and a bloody knife in his pocket, he worries that he has committed a crime. On the advice of Dr. Middleton, Bone agrees to relax, going to a music performance by singer Netta Longdon. Riveted by Netta, Bone agrees to write songs for her rather than his own concerto. However, Bone soon grows jealous of Netta and worries about controlling himself during his spells.
Eileen O'Hara lives as a member of a cult in a remote retreat in the Adirondacks with her father, an embittered man since his wife's infidelity years earlier. Because his wife was untrue, O'Hara is determined that his daughter, Eileen, shall never marry. Peyster Sproul was the man who had the affair Mrs. O'Hara's infidelity, and when he shows up as president of the Sagamore Club and attempts to buy O'Hara's land, the two men come to blows.
Bored by her country life and misunderstood by her parents, Emma Rolfe marries Dr. Charles Bovar, an older man whose dedication to his medical practice results in wifely neglect. To alleviate her growing loneliness, Emma enjoys the company of many of the young men from the village and eventually begins an affair with Rudolph Bulwer.
Wall street broker Barry Dale is systematically ruined financially by his alleged best friend Richard Marvin . This Marvin does so that he can win Dale's wife Virginia away from the discredited broker. Dispirited and disillusioned, Dale heads to the West for a fresh start in life. Unfortunately, he soon develops the reputation as a coward, but he manages to dispel this by becoming a notorious outlaw, reasoning that highway robbery is not all that different from Wall Street chicanery.