Aircraft of the Third Reich

Has anyone bought the first volume of this book and does anyone know if the second one is still coming out.

http://www.aerospacemasterbooks.com/default.asp

I have been caught out before buying the first book of a set, and the rest of the set never comes out. I have sent them an e-mail tonight, so hopeing that i hear back. But when i cehcked there site, there is a full list of there pub;lications, but the only one you can click on is the first book in this series. So woundering if they are still operating but maybe the site is still up.

Just woundering if anyone here knows anything before i go buying a book and then the rest of the series never gets published.