Well, at least it's not Fifty Shades of Grey. The two top-selling books on Amazon.com right now are Johanna Basford's Secret Garden and Enchanted Forest. Sounds unremarkable enough, right? Could be ...

When Penguin Random House announced recently that it had acquired world rights to the next two adult coloring books from Johanna Basford, the so-called queen of coloring, it was just the latest sign ...