This is the culmination of the entire Redleg Security saga and is meant to be read as part of the series. While you would probably be able to follow along if you read this story on its own, it's likely to be somewhat confusing, especially in regards to the suspense plot that's been brewing for several books and the influence of multiple side characters and how they impact the main couple in this story. However, if you're feeling brave and want to read this on your own, then do it. I'm not the boss of you.
Content warnings are available on the author's website and at the back of the ebook.