Left Behind: The Kids, books #19 & 20, by Jerry B. Jenkins and Tim LaHaye (and Chris Fabry). Paperback.
I picked up this series years ago, after knocking out the entire run of the "adult" version of the series, including the prequels. There were some low points in those books (any 3-book concept stretched to 12+ will have low points, lots of low points), but some of the characters intrigued me. And I'm a completist, so I just kept reading them.
Somewhere along the line, I picked up these, the J/YA versions of the Left behind series. I must have started before I realized there were 40 books in the kid series. At least they're pretty short, and they are certainly quick reads.
Christian fiction often falls short in terms of subtlety and nuance, and the theme is considered more important than literary value. When you add the J/YA vibe on top of that, what is left is pretty simplistic. And that's what these books are.
That being said, the books have some strengths. Chris Fabry (the actual writer of the series, not credited until book 8 or so) writes clear prose, and the action certainly moves along at a nice pace. The books are quick reads, pretty short and fast-paced. And there is some skill in weaving in the chronology/events of the adult series into this series.
I'll pick up the next couple in the series over the Winter, and continue on valianty until I finish.