The film is divided into ten chapters. A secret vigilante society’s nine members pass judgment on others. They meet to decide the fate of a wealthy businessman they have been keeping under surveillance known as “The Man Who Has Lived Too Long” and vote to dispatch him with a homemade bomb concealed in a cigar case. Members Forrest (John Bowers) and Farallone (Lon Chaney) are both in love with the sole woman in the group, Lilith (Leatrice Joy). Forrest openly declares his love, but is spurned by Lilith, who is completely devoted to the “Cause”.
At a meeting later that day, as per their custom, Lilith deals playing cards, one at a time, to each of the society members; whoever receives the ace of hearts is to carry out the assassination. When Forrest is dealt the ace, Lilith offers to marry him that very day if it will give him courage. Forrest readily accepts, much to Farallone’s distress. After the couple marries, the grief-stricken Farallone spends the night in the rain outside their apartment.
The next morning, Lilith has been transformed by her love. She begs Forrest not to go through with the assassination. He replies that he is honor-bound to carry out his mission. He goes to the café where his target habitually dines and where Forrest works as a waiter.
A distraught Lilith pleads with Farallone to stop Forrest. Farallone agrees to help the couple escape the society’s punishment if Forrest fails his task, but extracts a promise of marriage from Lilith if Forrest is killed. Meanwhile, Forrest decides to abort his mission after he spies a young eloping couple seated next to the rich man’s table. When he returns to the secret council, the group’s leader, Morgridge (Hardee Kirkland), sends the couple away to await Forrest’s execution. Farallone begs the others to reconsider, but they are unmoved. When the cards are dealt, it is Farallone who gets the ace of hearts. Laughing, he carries out his part of the bargain with Lilith by setting off the bomb, killing all present.
By Wallace Worsley (YouTube) [Public domain], via Wikimedia Commons