There is trouble and death on the new bridge as men hear voices and die immediately after. Lamont gets a job on the bridge and is apparently the next to die.
When Lamont decides to look into the disappearance of a gangster associated with a political boss, the boss dies rather suddenly of allegedly pneumonia.
A philanthropist Senator is on trial for the seeming absurd charge of accepting a bribe from a deceased gangster. But the case becomes unexpectedly solid when the prosecution presents some motion picture evidence of the alleged incident.
A spy has been torturing a scientist to tell him the formula of a new explosive, but instead causes his mind to snap. So he kidnaps a fellow countryman psychiatrist Lamont just met and demands that he repair the mental damage done.
Lamont looks into the possibility of insurance fraud mixed with murder by an elderly couple whose maids have a curious tendency to die of pneumonia shortly after being employed.