25 - Brood of the Witch Queen by Sax Rohmer

A swan meets an enigmatic and tragic end, its neck seemingly twisted by otherworldly forces. In a nearby hospital, a young woman succumbs to a chilling fate, apparently strangled by unknown means. The mystery deepens as Sir Michael Ferrara is discovered strangled in his own bedroom, with no one else present. Dr. Bruce Cairn and his son Robert are drawn into a web of intrigue that reveals ancient, dark powers far beyond their understanding. Who is the enigmatic Antony, Sir Michaels adopted son? And what secrets lie within the brood of the Witch Queen? - Summary by Don W. Jenkins