This is Book One of a planned trilogy. It is a stand alone book and, while there might not be a definitive ending, there is a satisfactory one. A decision has been made. There will be consequences that may be revealed in subsequent novels. For this novel, there will be an end (literally) for several important characters.
An administrative note: There are occasional typos. As another reviewer observed, sometimes an age doesn’t make sense. Something that happened X number of years ago couldn’t have appeared where they appear in the story. For me, the novel was so fast paced and interesting that I wasn’t bothered by these things and didn’t notice them until they were pointed out by other reviewers. I felt a bit guilty because I think of myself as a critical reviewer. Some authors for whom I have reviewed books think of me in that way also.