A hopelessly hopeful drifter, a bitter young woman, and a helpless child live on the docks, spending their days in poverty and listless wandering. Overhead, a dredge hauls up mud and trash from the nearby seabed-- the same mud and trash from the day before. They finally decide to leave for the city to seek fulfillment, only to encounter further privation, destitution, temptation.

Arthur Randall becomes prosperous after divorcing his wife, Laura, and she now attempts unsuccessfully to win him back. Randall's son becomes ill, and he engages Joan Laird and her mother to care for the boy. Society misunderstands, and Joan is branded as a parasite. Laura kidnaps the boy, Bertie, and Joan gives chase. Laura's car goes over a cliff, and she is killed. Bertie survives the crash, however, and he and Joan attempt to find their way to a refuge. They become lost in the hills, and Joan manages to keep Bertie from dying until rescue comes.

Paul Granville becomes a famous painter for his portraits of great women as modeled by the beautiful Joline Hofer. When one of Paul's paintings appears to result in a miracle, Joline's life is changed forever. She leaves her previous life to live one of service and piety, a decision that ultimately saves Paul's life.

Ben Applegate's father dies, leaving him and his brothers Joe and Andy orphans and having to run the family farm. Their Uncle Grimes is their legal guardian, but he's only concerned with getting his hands on the farm. He has Ben declared incompetent and packs off Joe and Andy to an orphanage. When things look darkest for the three boys, help comes from an unexpected source.

Janet Loring is a young widow with a young son. She marries millionaire Malcolm Trask, but doesn't tell him about her previous marriage or her son, Ranny. Abandoned to the streets by Janet, Ranny eventually moves in with a bookseller and her granddaughter Margy. As the years go by Janet comes to regret abandoning her son and takes out ads looking for him. Marcio, a vicious blackmailer, sends Ranny to Janet posing as her son, not knowing that the young boy actually is her son. Complications ensue.

In Shanghai, an American girl who helps runs an opium ring meets an American agent disguised as a mining engineer. The two fall in love, and she has to determine where her loyalties lie.

Discovering that her husband is a bigamist, Nan returns with her child to her Puget Sound logging town. She is treated as an outcast by all save Donald, her childhood sweetheart, the son of a millionaire....