All The Parts of the Soul by Catherine Fearns

Perhaps all women are witches at heart… The year is 1545; Geneva has defeated the Catholic forces of the Duke of Savoy and established itself as the center of the Reformation, with John Calvin as its spiritual leader. But peace is fragile and the city ravaged by plague, the atmosphere one of fear and suspicion. So when new rumors of witchcraft emerge from the isolated village of Satigny, Calvin sees an opportunity, and plucks a reclusive young magistrate to investigate. Henry Aubert was orphaned by plague at the age of twelve, and since then he has lived alone, consumed by fear and by the temptations he finds in the margins of his book collection. Now, for the first time, he is forced to confront the possibility of society, friendship, even love. Local healer Louise de Peney is kind and beautiful, but skirts dangerously close to the fringes of his investigation. Can he escape the horrific task he has been set? And is it too late to save a soul that has too long been turned in on itself?