Latvia, overshadowed by the threat of a Russian invasion: A group of strangers find themselves as invited guests in a manor outside of the city of Riga. What starts as an evening being sweet-talked, money-milked, or drawn into inheritance issues takes a fiercer turn, when the manor's windows explode simultaneously, and murderous soldiers start killing whoever they can...

source https://www.free-ebooks.net/horror-gothic/Novella-Blood-of-the-Damned-Shadows-Over-Riga-The-Nosferatu-Experiment