Google search "hidden door bookcase plans".
Several photos and info therein.
Oh Ken you spoiler!! its not a hidden door any more!!
Have fun Stacy and dont forget to post a project !
if you go to the kreg owners' community search bar in the top right hand corner of your screen type in "hidden door" the first item on the new page is what you may be looking for and you can correspond with the builder if you have problems.
Here is a web address from this forum of a build.
Rockler has several hidden door kits.