Margaret Seldon's father, who has been victimized by three business associates and sent to prison, calls his daughter to him in his dying moments and asks her to avenge him. Through a detective agency she locates Amos Colby and Courtland Wells; and learning that the third man is dead, she adds his son, Allan Forbes, to the list. She foils Colby's attempt to ruin two financiers by gaining a position aboard his yacht.