Pierre Glendinning, junior, is the 19-year-old heir to the manor at Saddle Meadows in upstate New York. Pierre is engaged to the blonde Lucy Tartan in a match approved by his domineering mother, who controls the estate since the death of his father, Pierre, senior. When he encounters, however, the dark and mysterious Isabel Banford, he hears from her the claim that she is his half-sister, the illegitimate and orphaned child of his father and a European refugee. Pierre reacts to the story (and to his magnetic attraction for Isabel) by devising a remarkable scheme to preserve his father’s name, spare his mother’s grief, and give Isabel her proper share of the estate.