In two different regions of the country, two people were poisoned by hydrogen sulfide in hot springs. Police ask geochemist Aoe Shuske to conclude: death is caused by "natural" poisoning or is it murder. During the study, Shuské meets Uhar Madoku. The girl correctly assumes that a natural phenomenon is to blame for these deaths. However, the police begin to suspect Madoku of the death of the victims, but the third victim of the “source” unexpectedly dies ...
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