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In this 15-chapter adventure serial produced by Vitagraph, a young girl (Carmel Myers) must build a railroad line from the Alaskan gold fields to the ocean in order to claim her inheritance. She is opposed by a gang of crooks, but finds an ally in a handsome young engineer (Wallace MacDonald). Leading lady Carmel Myers was the daughter of a rabbi and became mainly known for portraying exotic sirens (e.g. the temptress Iras in Ben-Hur, 1925). A notorious scene-stealer, on as well as off the screen, Myers remained a familiar name in Hollywood society right up to her death in 1980. Released in late 1921, Breaking Through also featured Vincente Howard, Walter Rodgers, Martha Mattox, and William McCall.