Out of my collection of Ready To Read books this is the only one I own that has the poster still intact. Not to speculate but I beleive the person I bought this from wasn't even a Voltron fan with their daughter buying the book back in 2018 presumably at a school book fair, cause Allura looks cool. 

This Book has Allura explain Voltron's origin's we learn about the original Paladin's, how Zarkon became corrupted by power,how Allura met the current paladin's and her own journey to becoming Blue's paladin. 

I like some of the imagery in this book compared to some of the other books the art is consistently close to being on model and doesn't have any errors, though Allura's own story feels overshadowed by Alfor and the focus on Zarkon's fall from grace.