The Book 1 isn't finished - there are two more parts to go. However, Lukas (author), currently has two jobs, so unfortunately, he has no time for the novels right now.
I was talking about this with him personally and we agreed on that he should take a break from the novels for some time, rather then force himself to do it after so much work, which could have negative impact on quality.
He is most likely to quit the sidejob and then continue the novels. I really look forward to the last two parts.