There are 2 books in the The Reason series. The newest book is Five Unicorn Flush which came out in 2019.

1
Space Unicorn Blues

Book cover of Space Unicorn Blues
Humanity joining the intergalactic community has been a disaster for Bala, the magical creatures of the galaxy: they've been exploited, enslaved and ground down for parts. Now the Century Summit is approaching, when humans will be judged by godlike aliens.

When Jenny Perata, disabled Maori shuttle captain, is contracted to…
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2
Five Unicorn Flush

Book cover of Five Unicorn Flush
Reasonspace is in shambles after the disappearance ofall magical creatures. Without faster-than-light travel, supply andcommunication routes have dried up, leaving humankind stranded and starving.Cowboy Jim and his complement of Reason soldiers search for the relocated Balausing the only surviving FTL drive. On their new utopian planet, the Bala areon the…