Fearing an epidemic of typhoid among the workmen, the foreman suggests that they be vaccinated. The boss assents, and as the foreman recommends a specialist of his acquaintance the work of putting the affair through is turned over to him. The engineer, Christie, is persuaded by Andrews to have himself vaccinated. He does so and is taken mysteriously ill immediately afterward. A doctor who is called in says there are signs of foul play. Queer is called in to take the case up. Christie, meanwhile, is succumbing to what appears to be sleeping sickness. Queer finds out from Andrews what doctor did the vaccinating. He calls but finds the doctor out. Without waiting for permission, Queer enters the house by the basement and finds in the doctor's laboratory serum for sleeping sickness and anti-toxin for it. Queer takes the anti-toxin and hurries out to administer it to Christie. While Queer is thus engaged Andrews calls to inquire after his boss. Queer becomes suspicious and follows Andrews....
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