Loosely based on the life of NY Police captain Cornelius W. "The Gang Buster" Willemse. Mary Kennedy, the daughter of police lieutenant Jim Kennedy, gets involved with an unethical criminal attorney and is thrown into the world of corruption. However, when she twists the law to obtain the acquittal of a client and the man later shoots her father, she begins to see the error in her ways, determined to take down the corruption she works for.