Abandoned as an infant on a stranger’s doorstep by her faithless mother, Marcella, Dorothea is taken in by Tom & Sarah Wentworth who in time inherit a vast coal mine in Pennsylvania. Now a young woman “Dot” falls in love with veterinarian Dr. Grant Hunter but her social climbing mother frowns on the match. Sara has set her sights on the Marquis del Carnavacchi for her daughter unaware that he is both a mobster and the lover of her errant natural mother. By chance Dot’s real father, Jim Gregory, also resides in the town and as tensions rise, he and Marcella join to save Dot from both harm and marriage to the wrong man.