I will be very disappointed and annoyed if there is no sequel.
Alien Space Bats? No.
At least not yet.
Do start with the first book.
Mr Lenz is full of surprises. I didn't see this coming. I mean this is the nicest way possible. Some of the things happening to our poor castaways are predictable, of course soceity, civilization and good manners will break. But, surprise, not as badly as they usually do in this kind of story. And, instead of going on about this in the usual way, some of our protagonists *and* antagonists behave much better than one could hope for.
We also learn that this probably isn't time travel. At least not ordinary time travel.
The only little grouch I have is that I don't think Smilodon kittens grow up quite this quickly.
Warmly recommended.
I am now going to reread a 91 years old story. Sideways in Time...