''Set This House in Order: A Romance of Souls'' is a fantasy/mystery novel by Matt Ruff, published in 2003.

[[NiceGuy Andrew Gage]], created [[YoungerThanTheyLook two years ago]], is the public face of a [[SplitPersonality multiple personality]]. There are hundreds of souls in his head. In the world outside, Andy works on ambitious, but unlikely, virtual reality projects.
There, new programmer Penny Driver turns out to be a multiple personality, too, and the boss wants Andy to help her. Several of Penny's other souls ask for help, which Andy finally, reluctantly, agrees to give, thereby setting himself on a path that threatens the stability of his house.

!!!This book provides examples of the following tropes:

* AwesomeButImpractical: Julie's virtual environment project
* {{Badass}}: Seferis, Maledicta, Malefica
* ClusterFBomb: Maledicta
* DarkAndTroubledPast - obviously, but not sensationalized
* DeadpanSnarker: Adam
* EpiphanyTherapy - beautifully averted
* FightingFromTheInside: [[spoiler:Gideon vs. Aaron, Gideon vs. Andrew]]
* GollumMadeMeDoIt
* JerkWithAHeartOfGold: Maledicta, Adam
* MagicRealism (perhaps, probably not)
* ManChild: Jake
* NiceGuy: Andrew
* RapeAsBackstory
* ShownTheirWork
* SplitPersonality - obviously
* SplitPersonalityMerge: [[spoiler: Penny, at least partially]]
* SplitPersonalityTakeover: the original Andy Gage doesn't exist any more
* TalkingToThemself - a lot
* TheLadette: Maledicta
* {{Tsundere}}: Julie