To look at 'ppi' "measured in LR and PS" is almost meaningless.
What is the Pixel size dimensions of your image?
Divide one pixel dimension (eg. width) by 200 to estimate what inch size your image will look best at.
eg. if you image is 600x900 pixels, at 200ppi it will print best at 3 x 4.5 INCHES! How big are your book pages?
Book module will accept a lower resolution eg. 100ppi, but your image quality will suffer if printed at that ppi.