Block webpage unless user is registered. Need help and suggestions

My goal is to block a single webpage which contains special content that only registered users can view. I do not want to make users login through wordpress (I don’t want them to see the dashboard or anything else associated with wordpress). I would like a “front end” solution. I have tried the Profile Builder -front end user registration and login. I really like the simplicity of this plugin except for the fact that I cannot block that specific webpage. Is there anything else out there that can do this I have not found yet? I do not want to charge to view the webpage, I would only like their email address.
Thanks for your help in advance.