Warning: Spoilers abound. If you haven’t read The Book of D’ni, I suggest you do so before proceeding. You can buy all three novels here.
Myst: The Book of D’ni is not a particularly successful book. It doesn’t really have any characters, its plot is disjointed, and its events have little to no bearing on the rest of the series. I’ve slotted it into the fourth place here because its events take place between Riven and Exile, but in all honesty it could have gone anywhere; in fact, its presaging of the themes of Uru might actually make it more relevant there. These are the challenges when working with a book as disorganized as this one. Like Riven, The Book of D’ni is highly ambitious, but unlike Riven, it falls very short of its goals.
Warning: Spoilers abound. If you haven’t read The Book of Atrus, I suggest you do so before proceeding. You can buy all three novels here.
Myst: The Book of Atrus was published in 1995, well into the heyday of the original Myst but still two years before the release of Riven. It appears to set two basic goals for itself: to expand the backstory of the original game and set the stage for the new one. The book is credited to Rand and Robyn Miller, Myst’s foremost creators, with coauthor credit to David Wingrove, an SF writer previously known for Chung Kuo, a sprawling epic about a future in which Imperial China rules the world. (In true diehard-fan fashion, I attempted to read the first of these volumes, with no success.) As a work of literature, the novel is probably slightly better than your average science fiction novel, at least stylistically. As a part of the Myst canon, this novel (and the other two) form a sort of backstory-bible, one which became so integral to the series that the games eventually came to depend on it.