Reddit mentions of Myst: The Book of Ti'Ana

Certainly! You can get the novels separately or combined as the Myst Reader.

In chronological order:

• Myst: The Book of Ti'ana tells the story of Atrus' grandmother Anna/Ti'ana. She lived in the Cleft on the surface and discovered D'ni, later marrying Aitrus (after whom Atrus was named).
  
• Myst: The Book of Atrus tells the story of Atrus growing up under Anna, before he's taken by his father Gehn. Takes place before Myst, but really serves as more of a prequel to Riven.
  
• Myst: The Book of D'ni takes place between Riven and Exile, detailing Atrus and Catherine's attempts to rebuild D'ni.