A book in a dream often represents knowledge you're seeking or a story about yourself that's still being written. An unreadable or blank book can point to self-understanding that feels just out of reach, while finishing one may reflect a chapter of your life reaching genuine closure.
The dominant star being in the Midheaven, exalted or in its domicile and taking part of the ascendant. - Picatrix (Andalusia, ~1000.AD)