The Black Moon marked Winston Graham's return to the Poldark series, which he had inexplicably allowed to lie fallow from the 1953 release of Warleggan, to the 1973 publication of this extraordinary novel. The title of this book comes from an ancient myth with roots deep in Cornwall's Celtic past, of an astronomical/meteorological condition called a "black moon" and the curse it is said to place on the life of any child born under it, as the son of Elizabeth Warleggan (nee Chynoweth, later Poldark) was. Though George Warleggan, now married to the woman he has long loved from afar, Elizabeth, should be a man at peace or one at least basking in the glory of at last achieving a great ambition, he quickly becomes a figure lost in a personal torment that may or may not be linked to the curse of the black moon. Where he might be thought pleased with his new wife...and son...his titanic fortune, his power, now so great that this blacksmith's grandson can easily buy his way into the nobility, George becomes more restless chapter by chapter, and his hatred for his old rival, Ross Poldark, magnifies till it seems ready to consume him.
Against the menace of Warleggan's stormy soul, Demelza's two brothers, Sam and Drake, honest young men of ardent Methodist leanings, appear in the series (and are soon at odds with Warleggan) as does a shy, scholarly cousin of Elizabeth's, Morwenna Chynoweth, for whom George Warleggan arranges what should be a suitable marriage to a well-placed churchman, but which is in fact the last thing the introverted Morwenna ever wanted, and is in all reality a tragic disaster. In this book, Dr. Enys, having accepted a position as a surgeon aboard a warship, is taken prisoner by the French, and Ross and a party of mercenaries he assembles travel across the Channel to secure his friend's release. Amid all this one finds remarkable tales of the niceties and unpleasantnesses of eighteenth-century Cornish life. There are also larger-than-life characters, exciting situations, and informative moments that highlight the influence these earlier times in our culture's evolution had on what is, temporarily, the present.