Well, not actual Mars, of course. That is still only inhabited by robots. But, in the world of the Crater School, Mars is most definitely alive. Three Twins at the Crater School is now available for purchase. There are links to various stores here. I’d love to be able to link to Bookshop.org as well, but for some reason they are listing it.
Anyway, enjoy. And if you can do so please leave a review on Amazon. I know this gets very boring, but it really does make a difference.