Showing Agatha Raisin and the Witch of Wyckhadden by M. C. Beaton
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Left with bald patches thanks to the wicked doings of a murderer from a previous investigation, Agatha flees to coastal Wyckhadden to re-grow her lost locks. With hair tonic supplied by a local witch, Agatha's tresses begin to flow - but the witch is found bludgeoned to death.