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Perry defends a sweet old lady who was nurse to a wealthy woman. Apparently, when the woman died, arsenic was found in the milk she was given just before her death.
A powerful newspaper columnist who browbeat everyone around her is murdered. And a book containing the names of innocent pople who could be slandered is now missing.
While sailing home on a cruise ship, Perry and Della briefly meet an accountant who is later pushed overboard. His wife is accused of killing him, and his daughter has mysteriously disappeared.