(Audible)
Hugh Howey
never disappoints--his books are a welcome respite from much of the drier reading that I do related to my work as an Africanist and Foreign Area Officer.
In "Beacon 23", Hugh Howey takes us for a ride with a PTSD'd out alien-fighting grunt turned (interstellar) lighthouse keeper. Yes, Howey imagines a future in which "lighthouse beacons" are placed amidst warp speed preventing asteroid belts. The lighthouse keepers control a device that, when activated, allows ships to pass through the asteroid belts without collision. Without that device activated, any passing ship will obliterated. Couple this setting with a pending alien invasion and a possible love interest and you've got "Beacon 23"--a great story you'l devour.
See our 2019, 2018, 2017, 2016, 2015 and 2014 Reading Lists.
Related Fiction:
If you're looking to branch out on the sci-fi front, check out "The Three-Body Problem" by Cixiun Liu who is pretty much the most famous sci-fighter writer in China.