Borne in Blood — Chelsea Quinn Yarbro

The year is 1817. In Switzerland, the Count Saint-Germain leads a comfortable life with his paramour Hero whose husband died fighting Napoleon. Saint-Germain's loving kindness cannot keep Hero from missing her children who are being raised by their hard-hearted grandfather. The Count has become intrigued by the work of an Austrian noble investigating the properties of blood, a subject always of key interest to a vampire. But when the noble's beautiful ward fixates sexually on the Count, the vampire fears for himself and his gentle lover.