The Myriad (Tour of the Merrimack #1) by R. M. Meluch published by DAW is currently $1.99 in the US
https://store.kobobooks.com/en-us/ebook/the-myriad
https://www.amazon.com/Myriad-Tour-M.../dp/B002EBDOME
The U.S.S. Merrimack was the finest battleship class spaceship in Earth's fleet, able to stand up against the best the Palatine Empire could throw at them, even able to attack and kill swarms of the seemingly unstoppable Hive. But nothing could have prepared the captain and crew of the Merrimack to face the Myriad-three colonized worlds in the midst of a globular cluster that the
Hive had somehow overlooked.
I haven't read the book yet but this review by Jo Walton interested me enough to buy it.
http://www.tor.com/2012/08/29/romans...rrimack-books/