The sisters learn that Kate survived the initial attack but is now being held by the powerful vampire leader Thorn and his right-hand, Tatiana .
The mission becomes even more critical when they discover that Kate, a scientist, is researching a vaccine to heal humans from vampirism—a major threat to Thorn’s clan.
Along the way, the sisters are joined by Marcus , a human they meet at a bar, and they receive help from an experienced vampire hunter named Bullseye .