Another galactic empire.
A space navy very closely based on the 18th/19th century Age of Sail British navy. This includes propulsion almost entirely by solar sail--seemingly including at FTL speeds. Grappling hooks, boarding parties, cannon.
A reptilian alien species who call themselves Theropods--i.e., the name we give to the category of dinosaurs that includes Tyrannosaurus Rex and the ancestors of birds. Okay. I mean, it seems unlikely, but, okay.
Our heroes, Subcommander Liam Blackwood and Sublieutenant Amelia Virtue, are the executive officer and the quartermaster of HMSS Daring. (That's "His Majesty's Sailing Ship, by the way, not "Space Ship." Those solar sails, able to propel these ships at FTL speeds...) They're hunting down pirates led by the nefarious, mysterious Dark Star. We meet them, and the captain, Commander Sophia Riverton, as well as the ship's doctor, Sublieutenant Dr. Ava Templegrey, as they're heading off to a gala ball while ashore resupplying the ship. Riverton, Blackwood, and Templegrey are all midlevel nobles; Virtue and other crew members we meet are commoners. Within a very hours, they'll be heading off again, much sooner than planned, with a new enemy in addition to the pirate, Dark Star.