Dr. Henry Jekyll experiments with scientific means of revealing the hidden, dark side of man and releases a murderer from within himself.

Second release in James Montgomery Flagg's 'Sweethearts and Wives' series of short comedies.

Peter is smitten with Winifred, a model, whom he met on board the steamer returning from Europe, but is discouraged by his sister, Ena, who is more ambitious for him. Peter is the son of Peter Rolls, the wealthy New Yorker. Ena tells Winifred that Peter is engaged to Eileen, sister of Lord Ravglan and that he is just trifling with her.

Tommy Burke, a good-natured young plumber who refers to his monkey wrench as his pipe organ, is unaware of his inferiority complex. One day he learns that an eccentric uncle has died, leaving him a brown derby said to bring good luck to its wearer. Meanwhile Edith Worthing and her Aunt Anna are expecting Edith's wealthy uncle, Adolph Plummer, from Australia. On a call to their house, Tommy is mistaken for the uncle, being announced as "a plumber," and soon a mutual romance develops with Edith. They are wedded by mistake when serving as witnesses to marriage by elopement. Farrell, a rival for Edith, learns of Tommy's deception and persuades Edith to elope with him; but Tommy follows in hot pursuit, in his pajamas and derby. At the last minute, a message arrives telling Edith that she and Tommy are already married.

Two young men try to wrest their father from the clutches of a gold digger but by mistake think the woman is a young nightclub singer with whom they both fall in love.

At a dance on his parents' plantation in the early nineteenth century, Harry Rutter wins a duel with Langdon Willetts, but loses his fiancée, Kate Seymour, who disapproves of fighting. He is thrown out of his family home and forced to stay with others. Tired of accepting charity, Harry leaves for South America. Now he returns a rich man to a ruined home.

Mary stands by Jack after the Depression of 1929 but considers divorce when he again becomes successful by 1935. Bill, who loves Mary, works at keeping them together.

Stephen Browning, a minister in a small city, is unable to cope with the strong opposition in his parish, which is fostered and led by Raphael Creeke, his rival for the love of Irene Manton.

A young girl is reared on a desert island by natives and led to believe that she is a goddess. One day an outsider comes to the island, and persuades her to accompany him to preach about the kindness and love she has experienced. She agrees, but she's soon confronted by the problems and travails of the "outside" world.