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When her mother (Margarita Fischer) leaves her father for a Wall Street magnate (Thomas J. McGrane), Melissa (Fischer again, in a dual role) is sent to a convent. On her return, her father bitterly tells her that Fifth Avenue is a dragon, with its side streets functioning as its claws. But the girl heads off into the dragon's mouth anyhow. Her innocence is her protection, but it's disastrous for everyone else she encounters. She finally winds up at the millionaire's house, holding a package which, unbeknownst to her, contains a bomb. She convinces her mother to go back to her father and the bomb, which is left behind, explodes after they've gone.