Don't worry... it doesn't end... and Yeager gets worse, finally reaching the point (IIRC) where he turns traitor and tells the invaders that it was the US that nuked their ship. It may be this plot element that seems to have truncated the publishing of this continuing series...
Thanks for the update. After I realized I wouldn't finish the novels, I did some reading up on Amazon's review pages. I gave up reading even the crib notes version and didn't know that Yeager went turncoat. Ugghhh. Yeager. There's something about him that makes him with worst villain in that series (even before the perfidy)--his behavior with Barbara & Jens, the awful "friendship" and "understanding" of the Lizards...I can't put my finger on it, but he was truly a disturbing character...and Turtledove tried to paint him as a hero!
"It may be this plot element that seems to have truncated the publishing of this continuing series..."
I guess you haven't been following the series. It's now up to about 10 books, including "Homeward Bound" that just came out. It certainly hasn't been 'truncated'.
Sam Yeager found out that the Lizards were going to undertake a massive atomic retaliation against the world that would have killed hundreds of millions of people. He also did not like the fact that we launched a sneak attack against civilians. He did what he thought was right. But even later he still is conflicted about the incident and wonders if he did the right thing.
It was certainly not an easy decision for him.