Will Fraizer Orchantraya’s grandkids save the day?

"This book links to another book by this author that is called “Fraizer Orchantraya” and I highly recommend reading that book as well. This book is about Fraizer Orchantraya’s grandkids, who must get some education and then use the skills that they’ve learned to fight against a Shadow People threat. But, wait!, perhaps all is not as it seems… The characters are really interesting (all four of the brothers are very different from one another in intriguing ways), and the way that the book links to “Fraizer Orchantraya” is done very well. I highly recommend reading this book, and I look forward to reading more books by this author."