You remember her once mentioning that her father was a
doctor? Possibly she dispensed his medicines for him, or she may
have taken the idea from one of the many books lying about when
Mademoiselle Cynthia was studying for her exam. Anyway, she was
familiar with the fact that the addition of a bromide to a
mixture containing strychnine would cause the precipitation of
the latter. Probably the idea came to her quite suddenly. Mrs.
Inglethorp had a box of bromide powders, which she occasionally
took at night. What could be easier than quietly to dissolve one
or more of those powders in Mrs. Inglethorp's large sized bottle
of medicine when it came from Coot's? The risk is practically
nil. The tragedy will not take place until nearly a fortnight
later. If anyone has seen either of them touching the medicine,
they will have forgotten it by that time. Miss Howard will have
engineered her quarrel, and departed from the house. The lapse
of time, and her absence, will defeat all suspicion. Yes, it was
a clever idea! If they had left it alone, it is possible the
crime might never have been brought home to them.
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