From previous threads about this sort of problem, I seem to remember the best suggestions seemed to be:
1) Air outside, if possible standing the book on its end so the pages will fan open a bit and get air between them.
2) Tumble dryer sheets between the pages, or even spray very lightly with Febreze if you're not worried about tiny water mark splashes.
3) Put the book in a plastic bag with some bicarb of soda, seal the bag and leave for 24 hours. The bicarb should brush off easily enough if it gets in the pages and is brilliant for absorbing smells.
Perhaps if it's really bad a combination of all the above will do the trick!