a first page

Hello Support,
My client would like an initial first page that the user will see when coming to the website. This first page is not the home page and it is only viewed upon entry to the site. It is a women's crisis center, and the first page will tell the user about the method to escape the this website in case someone is looking over her shoulder at what she is viewing online. (The escape method is just a red link at the top of every page on the website that will take them to google.) Is there a plugin that will create a first page?
Thanks,
Carol