While a son is born to Joseph Conway, he is overjoyed. Not so his cousin, Dr. Brennan, who, by the advent of the child, has been kept out of a fortune which would ultimately have come to him. The doctor talks over his ill luck with his housekeeper, a hard, grim woman, who suggests getting the child out of the way. Being in financial difficulties, the doctor calls on Conway to borrow some money which his cousin gladly consents to do, and accompanies him to a bank so he can get the cash immediately. Before they reach the bank, however, Conway is run down by an auto and taken to the doctor's house. Here the housekeeper gets hold of him and before Dr. Brennan realizes what has happened, poisons him. The housekeeper then calmly suggests to the shocked doctor that the baby now alone remains between him and the fortune. Dr. Brennan, apparently, in all sympathy for the bereaved Mrs. Conway, suggests her going to a hotel in the suburbs with her baby to get over her grief and tells her he will accompany her. The hotel has been annoyed by sneak thieves and a woman detective, Miss Kate Graham, has been employed. The coast being clear, one evening, the doctor kidnaps the baby and hides it in a dog bag which he carries away the next morning and delivers over to the housekeeper. Her suspicions being aroused, Kate gets on the job and traces a tag which came from the bag to the doctor. She succeeds in rescuing the child after several thrilling experiences, one of which culminates in the accidental death of the housekeeper and brings the baby to Mrs. Conway, who is being comforted by her false relative. Kate confronts him with his guilt and he is not strong enough to deny it. The mother and child are reunited and Kate is showered with thanks.
—Moving Picture World synopsis