Young Terwilliger, an orphan boy in New York City, "adopts" Old Archer, the caretaker of Gramercy Park, after the man is arrested for beating Terwiliger for picking a flower for his dead mother. As Terwilliger grows up, he falls in love with Helen Raymond, a pretty neighborhood girl, but finds a rival for her in Harvey Livermore. When World War I breaks out both boys enlist in the army and are sent to the front lines. Complications ensue.