Reference:Atrus, opening voiceover (Myst)

[Atrus]
I realized the moment I fell into the Fissure that the Book would not be destroyed as I had planned. It continued falling into that starry expanse of which I had only a fleeting glimpse. I have tried to speculate where it might have landed, but I must admit that such conjecture is futile. Still, questions about whose hands may one day hold my Myst Book are unsettling to me. I know my apprehensions might never be allayed, and so I close, realizing that perhaps the ending has not yet been Written.