Lock down /members-content/ URI so user must be logged in

Hi there,

I have section of my site, that I want user to have to be logged in to see, the sections is located at /members-content/ and has various subpages which will site at a URL like /members-conteont/page1 etc. How can I make sure the user is logged in if they try to access these pages and display amessage advising them to register and login if they want see the content?

Thanks