The Book of D'Ni (Myst, Book 3)

The third novel by the creators of the CD-ROM games Myst and Riven. Catherine and Atrus return to the devastated domain of the D'Ni civilization to fulfill their destinies. But as they begin to search the many worlds, seeking the survivors Ti'ana told them of, they find clues that bring them to a hidden book and discover a secret that the D'Ni masters planned long ago