Mike Kildare, a swaggering youth from New York City's Bowery at the turn of the century, comes to the defense of Mamie Rose, a mender in a secondhand clothing shop, when his own gang of Irish-Americans insult her.
Young millionaire Turner Brooks is engaged to marry the poor but sweet Dora Carton however the maliciously rapacious Emma DeWolf wants to snag him for his money. Both before and after their marriage Emma tries every means to poison his mind against Dora but ultimately fails.
An American munitions manufacturer and his son become ensnarled with enemy agents from Germany during the First World War.
Sir Joseph and Lady Webbing are the foster parents of Marie-Louise. The couple are also in league with Verrinder, a German spy. When their work against England is discovered, they commit suicide. Marie-Louise, who has been an unwitting part of their schemes, is allowed to go to the U.S. if she promises to keep everything a secret.
Loyal slave of the aristocratic Dabney family, Dan is overjoyed when Raoul becomes engaged to Northerner Elsie Hammond and his sister Grace becomes engaged to Elsie's brother John. When the Civil War breaks out, the heartbroken Hammonds return North and John joins the Union army. Raoul joins the Confederacy, but his vindictive overseer, Jonas Watts, becomes a Union officer. Watts takes Grace prisoner, but before he can act on his desires, John rescues her.
When Roberta Carruthers' father, Capt. Carruthers, is killed in France during the war, she comes to live in the US with her uncle. When she finds out that her uncle is under the impression that his brother had a son and not a daughter, she decides to disguise herself as a male, and calls herself Bob.
A rich girl's fiancé poses as a chauffeur to stop her eloping with a major.
Blind Eleanor is cared for by her father's friend and eventual lover, Burton Lester, who arranges a sight-restoring operation. Upon recovering her sight, Eleanor discovers Burton is married, leading her to seek independence by completing her father's art and becoming a renowned artist in New York. After a misunderstanding involving a lost necklace and Burton's kindness to a friend, Eleanor reconciles with Burton and they become engaged.
Until her rescue by a Salvation lass Margaret Reeves is trapped in white slavery. Upon her escape she is sent to a ranch where she falls in love and marries a cowboy, keeping her past secret. The man who once owned her appears and her husband learns the truth. He sends her from the house, but a young Indian mother engineers their reconciliation.
John Dale, a lawyer, who, after a trip to the Middle East, is asked by his niece why he's never married, leading him to recount a tale of a yachting party and a love affair.
Society girl Sybil Lawton is left penniless by her father's death, and though her mother wishes her to marry into wealth, her sole ambition is to achieve fame in the theater. Her youthful charm and talent interest producer Stewart Thrall, who finds her a position with an Omaha stock company. Under Sybil's encouragement, fellow actor Jim Roberts, disillusioned by an unhappy marriage, improves and becomes her self-appointed guardian. Sybil returns to New York and begins rehearsals for "Romeo and Juliet" with Thrall as her costar and Roberts as stage manager. Meanwhile, Thrall's unhappy wife obtains a divorce, and Roberts, recognizing her as the woman who ruined his life, blames Thrall and shoots him at a performance as he bends over "Juliet" on her bier. Thrall recovers, however, declares his love for Sybil, and looks forward to happiness with her.
Arsdale, a candidate for mayor misconstrues the situation when he sees his wife Alice enter the apartment house of gambler Norton. Unknown to him Alice’s sister Mabel had married the dissolute Norton and made her life misery. Norton, recruited by Arsdale’s rival to incriminate his opponent surreptitiously tries to compromise Alice and Arsdale, consumed with jealousy shoots him, ruining all their lives.
Surgeon Crisp announces to his student doctors and friends that he has solved the problem of limb-grafting, and shows proofs. Among those deeply interested is Mortmain, a musician and a friend of the surgeon.
The picture starts with Robert Warwick walking into the office of director Albert Capellani (the film's actual director). Capellani offers him the role of a heavy and hands him the script. The next four reels show Warwick playing a Raffles-like character, an ingenious crook who moves through society, committing robberies and even murder.
Fernande marries a man and schemes to get his wealth when his expected death occurs. But he dies before he can change his will. She next tries to kill the son who inherits, but he outfoxes her.
Sure-Fire Flint, an energetic chap just returned from wartime military service, meets June De Lanni, the girl of his dreams, while working as a cabdriver and busboy. Her father gives Flint a job in his factory, but Dipley Poole, who hoped to marry June, becomes jealous of Flint's success and attempts to rob the company safe. June is trapped in the safe, but after a series of adventures, Flint arrives in time to rescue her.
A waiter in love with a countess assumes the identity of an aristocrat.
Helene Palmer and her husband Orrin have grown apart, and she becomes infatuated with bachelor Edward Wadsworth. With the outbreak of World War I, Orrin and Edward enlist, while Helene works as a Red Cross nurse in a small French town. Edward is wounded on a dangerous scouting mission near the town and Orrin carries him to safety. The enemy invades during the night, and Orrin rescues Helene as she is about to be overpowered by a German officer. The dying Edward, morally strengthened by his experience as a soldier, encourages the couple to reunite. Soon after, peace is declared.
Lord Edward Litchfield is in love with Beth, a beautiful American girl of modest descent. Lord Edward's father goes to Beth and tells her that if Edward marries her, it will ruin his entire career and, at the same time, be a great shock to her parents. Beth bows to his will and on her next visit tells Lord Edward that her love for him has died. In time Edward marries elsewhere and Beth enters a nunnery.
Newly immigrated from Russia young factory worker Irma loves Alex, and they plan to marry. When he is killed in an explosion a heartbroken Irma finds herself in the family way. Alex’s brother Ivan proposes marriage though it costs him the love of Margaret. Years pass and Ivan becomes successful in business, finding himself in competition with his former employer for a large contract. Margaret, still bitter at being spurned, works with Ivan’s competitor to steal information on his bid for the job. Ivan discovers the plot in time and a race to the state capital ensues between him on a special train and his adversaries in a car alongside. A collision leads to a divisive victory for Ivan who also comes to realize his heart truly belongs to Irma.