Lightroom 4 book module is not consistant in saving the the books. If you copy and past a page template they seem to be tided together some how. even after you add different photos and close out light room, and go back to it later... be ware your work might get wiped out because. I am not sure what is causing the the glitch but i will not trust the book module untill some update has been done about its glitchyness. The sad thing is the book module is one of the main reasons i upgraded to 4.