Postal inspector assigned to investigate Harry Gruber's murder. He tracks down Sister Augustine, tracks gang members Soderquist and Ferrar, and infiltrates the criminal organization by posing as a corrupt inspector. He coordinates with the postmaster to anticipate a $1 million money shipment robbery, ultimately exposing the gang's plot and leading to a decisive shootout.
Postal inspector and key witness working together to solve the murder.
Protagonist's undercover infiltration targets the criminal mastermind.
Inspector uses a gang member to gain access to leadership.
Hotel employee secretly aids the undercover inspector.
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