Not sure if you are aware, but the Klingon Empire novel A Burning House is also part of that series. The series was rebranded for that book, but it continues on from I.K.S. Gorkon.
Since you only mentioned three novels I figured it couldn't hurt to point it out.
Thank you. I have already read A Bourning House.... and it was great, even without knowing the other stories. I've also read Diplomatic Implausibility. I couldn't get the Gorkon novels for a reasonable price until now.
Now I can (delivered from UK), and I'm happy. It's unlikely that these novels get a proper German translation anytime soon.