Some authors write long series in such a way that the individual books actually remain independent, perhaps with one overarching plot to draw them together. If you pick up any of the Chris Carter books you can read a good standalone novel, yet with characters that have been in 8 or 9 books. 'Final Justice' was not at all independent, and though I initially tried to push through the backstory, I just really struggled to wade through the long list of events and names.
I was actually rather disappointed, because the first chapter had me hook, line and sinker. I was drawn into Melody and Nick's story straight away. Yet it quickly devolved into a regurgitation of past plots. At first I kept up with main characters and their relationships, but once Melody went out for a boat trip with Johnston, it all just got too much to follow and I started to skim read and knew that my attention was waning.
I also struggled with the writing style, which is odd because I've not had that problem with a Jasmine Cresswell novel before. The dialogue especially was so stilted and formal that I struggled not to roll my eyes. It just wasn't natural at all and read like the written word rather than as a natural conversation, so it made it difficult to fall into the book.
I came on Goodreads to see what number in the series this book was, just to see how much I had missed, and some arsehole reviewer had not hidden their spoilers which I saw by complete accident, so it ruined the ending anyway, so at that point I just gave up.