Two men are killed by cyanide poisoning before Bony comes to Broken Hill to take
 up the case, and a third dies soon after he arrives. All die in crowded public
 places, and all are elderly and single. Witnesses recall a woman being near each
 man before he died, but their descriptions seem to be of entirely different women.
 Clues are old and witnesses have been mishandled by an inept investigator before 
Bony arrives in the prosperous mining town, but with the help of the local
 constabulary, a professional burglar vacationing in Broken Hill, and an 
amateur quick-sketch artist, Inspector Bonaparte mounts an investigation 
to identify the murderer before she finds another victim
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