[support] Specific Role for Specific Node Content

Hello All, I have created a new role 'Star user' and I want a specific eBook to be available to this role only after they have filled a webform linked to the eBook node:content. I have tried to use rules module but have been unsuccessful in creating one that works. Can some one assist/help me in either creating a rule or some other way to make the eBook only accessible to 'star user' where they fill-up the webform and download the product. Quaid J. Surti