An alcoholic former serviceman goes to work collecting debts for gangsters and committing various other crimes, then has a religious conversion and helps other alcoholics.

Venturing into some of the roughest slums of St. Louis, Jesuit priest Rev. Charles Dismas Clark dedicates himself to helping young ex-convicts who are struggling to rejoin a society that fears and rejects them. An especially wrenching case for the Reverend is Billy Lee Jackson, a troubled thief whose personal demons constantly tempt him back to a life of crime — and may ultimately make him pay the highest price for a few desperate decisions.