Just finished BITTER ANGELS by C.L. Anderson, and I enjoyed it. There's a woman in black holding a gun on the cover. Of course I enjoyed it.
No deviation from my norm here. This was kick-butt, female protagonist science fiction. My favorite thing. One minor difference, though. The main character was older and had children, which added an interesting depth to her. The only other older woman main character I can recall liking so much would be the one from Elizabeth Moon's HAMMERED trilogy.
I also really liked the relationships between the main character and her subordinates. I had several moments where my heart wrenched for her, and them, based only upon her responses to their pain. I love it when a novel evokes a physical reaction from me. It's rare. I'm a pretty even-keeled kind of person. For writing to get to me emotionally, that's very impressive.
Beyond the characters, BITTER ANGELS is full of great action, suspense, and a surprise ending. It seems clear that a sequel is intended. I look forward to reading it.