This is a nice mystery where the killer dispatches his victims via thallium (a heavy metal once used in rat poison) while convincing our protagonist that the killings are the work of three witches. One of the symptoms of thallium poisoning is loss of hair in large clumps and this hair loss is dropped as an early clue in our story. The only problem is that this is hardly the only symptom. Thallium poisoning is very painful which would lead one to ask why none of the victims sought medical attention which would cause investigators to suspect poisoning or disease as the common vector amongst the victims, however neither is brought until near the end when the villain gives us his grand reveal.
Review of The Pale Horse
