A mother and daughter are enjoying a park. While the mother reads, the daughter wanders off and is almost hit by a car. She is saved through the action of a princess, who is visiting New York and happens to be walking in the same park. The princess gives the daughter a necklace, and receives the heartfelt thanks of the mother. Meanwhile, Luigi, the mother's husband, is plotting with a gang of anarchists to deliver a bomb to the princess, disguised in a bouquet of flowers. The mother returns home and listens to the plotting through a keyhole. Luigi, suspecting that she overheard, ties her up, and takes the daughter along to deliver the bouquet to the princess. The mother escapes by lowering herself down a rope out the window and runs through New York streets to arrive in time. She grabs the bouquet from the princess and throws it in the river just before it explodes, but the explosion injures her. Luigi is arrested. At the hospital, the princess comes to visit the mother and brings the daughter along. With a police escort, Luigi is also allowed to visit the hospital. The princess witnesses his deep sorrow at the injuries he caused his wife, and intervenes to save him from prison.