When a disgraced medical student is sent into the outer realms of the Milky Way, to practice trans-species medicine as punishment, he discovers a plot to kill the imperial family and overthrow the galactic dynasty.
Currently, this is just a long way of saying the inciting incident which (as Richiev) has pointed out, is just the discovery of this plot. What happens next?
Why is he disgraced and what bearing does that have on the story? Why is it relevant that he is practicing trans-species medicine? At the moment, these are unnecessary to the story – as I understand it from this version of the logline. If they are really important then make sure we understand why.
Hope this helps.