The fifth book in the series, and it's a rather good one too.

So far, book by book, we're being slowly introduced to the various factions of the Universe and how things work.   This time it's time to be introduced to the space ship engines: the C-drives that are made and supplied by the Conjoiners and are completely sealed and non user serviceable.

Fans of Aliette de Bodard's Xuya stories will soon guess what the Conjoiners have done and enjoy this story just as much as they did Aliette's stories.

Available in the collection, Galactic North.

Next up, it's Aurora Rising. ( )