In normal days, kids don't have enough time to read this kind of informative books but yes, it could be a worth reading book in this quarantine. Last month, I purchased many books for kids and luckily, they read most of them with great interest. I also joined this online Bible study group and finally, I am using my lockdown days constructively.
By the way, I opened the link and see some book images. May I know how I can install a complete book for free? Or this offer has expired? I want books for my kids.