Fire Boss follows the journey of Edoardo and Maria Columbo, a resilient Italian couple who relocate to Roslyn, Washington, with their young son Marco. Edoardo rises to the position of fire boss in the coal mines while Maria sustains their family with her seamstress skills. Their lives are upended when their cabin burns down, leading them to find solace with the Russo family.

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Amidst hopes for a healthy pregnancy and a longing for home, Maria receives news of her family’s impending visit from Italy. However, tragedy strikes when a mine explosion claims many lives, altering their plans and setting the stage for their journey to New Castle.