Editing Myst: The Book of Atrus (section)

===Trapping Gehn (Chapters 17–23)===
In the prison room with Atrus is the descriptive book for Gehn's Fifth Age, [[Riven]]. Atrus having no other choice, links to Riven. After an accident he had with a [[Rivenese water|pool]], he is rescued by two [[Rivenese people|natives]], [[Carel]] and [[Erlar]]; he eventually falls in love with their cousin, [[Katran]], whom he calls Catherine because he cannot pronounce her real name correctly.

Katran was a member of the [[Guilds]] that Gehn intended to reestablish in Riven. Katran encouraged her friend [[Eavan]] to question something Gehn said to him, and in a fury Gehn had him executed. Gehn then left a fissure in the [[Prison Island|Great Tree]] and proclaimed that if he was ever questioned again, he would destroy the Age.

It was then learned that Gehn intended to wed Katran. Catherine and Atrus hatch a plan to stabilize Riven and trap Gehn there forever. She presents him with the 'impossible' Age [[Torus|she had written]] out of the lessons Gehn has been holding with her, and then the age of [[Myst]], which she claims to have written.

Atrus makes all the proper corrections to Riven and then links in to destroy all the linking books leading out of the age. He is captured by Gehn but is set free by a series of earthquakes and massive [[Moiety dagger|daggers]] that fall from the sky that Catherine writes into the age. She subsequently links in and escapes with Atrus after he has destroyed one of the two remaining linking books left on Riven. A [[Star Fissure]] opens up in the age and Catherine and Atrus escape through it with the Myst linking book, successfully trapping Gehn.