James Martin dies after drinking a cup of poisoned coffee. Circumstantial evidence accuses the dead man's sod, and he is arrested for the crime. Young Martin's sweetheart tries to prove his innocence, and succeeds in paving the way for the detectives to solve the mystery. The flat above the Martin apartment is occupied by counterfeiters, their tools and chemicals being hidden underneath the flooring of a room directly over the dining room of the Martins. One of the gang accidentally overturns a bottle of deadly poisonous acid. This fluid soaks through the plastering of the flat below and drips into the coffee, which kills the elder Martin. Through the discovery of the counterfeiters the mystery is cleared and an innocent man freed.
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