About Nexus: The Liberator
While not technically part of the Nexus canon (and therefore not counted in the ongoing numbering), The Liberator carries forward themes from Nexus: The Origin which was published immediately before the release of this series.
The framing sequences between Sundra and Juyl take place shortly after Sundra's arrival on Ylum as seen in The Origin. The main story is a flashback to the return trip after Nexus freed Dave and his fellow Thunes as seen in The Origin.