The Kissing Sisters
Two worlds sharing one orbit sounds like fantasy. Saturn already has a pair. How Janus and Epimetheus, with their horseshoe orbit, became the Sisters of Through.
Field Notes
Notes from behind Through: the real science the world is built on, and what I invented on top of it.
A History of 18 Scorpii
The path from a real star 46 light-years away to the world of Through. For those who want the rest of the future history.