There are 2 books in the Descendants of the House of Bathory series. The newest book is Firstborn which came out in 2017.

1
The Progeny

Book cover of The Progeny
New York Times bestselling author Tosca Lee brings a modern twist to an ancient mystery surrounding Elizabeth Bathory, the most notorious female serial killer of all time.

Audra Ellison has no idea why she's had her memory wiped clean, only that she chose to erase her past to protect someone…
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2
Firstborn

Book cover of Firstborn
From New York Times bestselling author Tosca Lee comes the much-anticipated, high-speed sequel to The Progeny, about the powerful descendants of Elizabeth Bathory, the most prolific serial killer of all time.

Face-to-face with her past, Audra Ellison now knows the secret she gave up everything-including her memory-to protect. A secret…