If you are looking for a "7th book" (или 7-я книга), you are likely encountering one of the following:
If you want to continue the story, I recommend starting the series, which begins with the book of the same name. To help you find what you need, skachat akademiia vampirov 7 kniga
Many fans consider Bloodlines ( Uzy Krovi ) to be the continuation of the story. It features characters like Sydney Sage and Adrian Ivashkov and consists of six books. If you are looking for a "7th book"