Zero (Nottingham, 2014).
I have developed the (bad?) habit of posting about a book while still reading it for the first time. Not only is this easy and enjoyable but it also means that, instead of reading an entire text, then writing a single review of it, I stay with the text for several posts, focus on details that might otherwise have been missed and ask questions that might be answered by further reading.
In Zero, what is the spaceships' means of propulsion? So far, the text has focused on space combat, criminal activity and undercover work, not (as yet) on explaining the hardware - but there is plenty of time for that.
Zero is not set tomorrow or the day after but further in the future. There has been time for:
cities with "spacescrapers" on the Moon;
a Lunar Revolution.
The tech includes "'...gravgen units.'" (pp. 30-31) Gravity generation? Are the ships propelled by artificially generated gravity fields? Further reading will tell.