A poor widow dies, leaving her two young children, Bob and Mabel, in the care of a poor neighbor, who later is forced by circumstances to give them to an asylum. Twenty years pass and Jack, who has been adopted by a good family, has now gone into business for himself and is a rising young broker. He has been searching the detective agencies for his sister, without success, for some years. Mabel ran away from the asylum and has been brought up by a poor family, is without education and is now employed as a servant, and on a certain day is hanging clothes on a roof nearby a large office building, in which Bob has his office, and a small boy is flying his kite from the same rooftop. Bob is on a balcony, or ledge, outside his office window and the janitor, thinking him gone for the day, closes and locks the iron fire shutters, locking him out on the balcony. A big deal is on, and after a long wait, during which he vainly tries to attract someone’s attention, he feels against his cheek the tail of the kite the small boy is now pulling in. He hastily ties a note telling of his predicament, to the kite tail, and sends it off. The boy finds it, takes it to Mabel, who leads a run to the rescue party and Bob’s assistance, and the two are reunited.