So I developed a site for a friend's bookstore and he is now asking me to mimic a feature he saw on another book site. I know it is using drupal and I can figure out that it's using some custom module named 'gbook' to integrate selling Google ebooks with ubercart. I cannot find any information on drupal.org or google about this module. Upon some google search hacking I came across several sites that appear similar in nature and have the same exact module installed.
I noticed that a few of them are using the RoopleTheme which links here http://www.roopletheme.com/ but I didn't find anything on that site about the module.
Does anyone know anything about this at all? I hate to tell my friend I can't exactly do what he's asking but I'm running out of options.