Four books, L, M, N, and O, have different page counts.

Solution

M has more pages than N but fewer than L, placing L at a higher count than M and N. O has more pages than M, which could place O above or equal to L. Since N does not have the least number of pages, it suggests that M or potentially another book could have the least, but without knowing O's exact count compared to L, it's unclear if O exceeds L or not. The least number of pages cannot be determined without more information on O's comparison to L.