A young Irish boy has fallen in love with a poor girl and wants to marry her, but his mother will stop at nothing, including murder, to see that he marries his rich cousin.
Based on the story of the real-life 17th Century Irish rebel and the eighteen century ballad about him, this one-reeler is one of the Kalem pictures shot by Olcott and his company on their second trip to the Emerald Isle.
Kathleen, the daughter of a fisherman meets Henry, the son of a Wall Street Broker, her father forbids their relationship, Kathleen defies her father, and travels to New York to be reunited with Henry.
Kathleen leaves behind her sweetheart in Ireland to emigrate to New York, finding a position in a sweet shop, until a strike forces her to seek employment in a department store, until poor health, diagnosed as homesickness forces her to return to Ireland and her sweetheart
