There's probably a spoiler or two ahead...
Previously in Spiderman...
Peter Parker is dead.
Otto Octavius is Spiderman. But everyone thinks it's still Peter, just acting differently, WAY differently.
Peter's mind sought to regain control but was seemingly eradicated by Otto.
Leading an army of henchmen and monitoring crime with thousands of miniature spiderbots all over the city, Spidey seems to be doing the job despite more ruthless methods and even some deaths.
Thanks to this new Otto-created spidertech, and of course the nifty mind-swap between the dying Otto and Peter (yay science!), the all new Superior Spiderman is in the ascendance.
Thanks to frequent (and the more recent) abuses of the space/time continuum, (see Age of Ultron), New York of 2099 is in trouble, and Miguel O'Hara, the Spiderman of that era, manages to make a trip to present day to try and fix it. There's a plot involving Tyler Stone - the head of super corporation Alchemax (who just happens to be Spiderman 2099's father) who has links to the past (our present day), so Miguel finds himself up against the Superior Spiderman in a bid to stop himself from being erased.
Confused? It all makes sense inside the pages of this brilliant story.
Running concurrent to the main plot, Peter Parker (but really Otto Octavius) has problems of his own. Trying to obtain his doctorate and open a new business isn't as easy as it seems, despite having the genius mind of Otto pulling the strings.
Plus, a new Goblin underworld is on the rise, lurking in the shadows, getting ready to strike.
Meanwhile, police officer Carlie Cooper has been following the Superior Spiderman's money, and has discovered that Otto Octavius is involved.
There's a whole lot going on in this story and it's all bubbling away to a certain showdown between the Goblin King and Spiderman in a future volume, once we've got Spiderman 2099, the Black Cat and Stunner out of the way (these latter two making appearances later in this volume).
Dan Slott has crafted another great piece to the Superior Spiderman puzzle. I've been loving it since it started and this is just as good as what has transpired in volumes 1-3. Ryan Stegman's artwork in issues 17-19 is great and Giuseppe Camuncoli, who steps in for the latter two issues, is superb as well.
You will definitely need to read all the Superior Spiderman volumes or you will be confused as to what is going on. I thoroughly enjoyed this volume and cannot wait for the next, starring Venom!
Whether Otto's reign as Spiderman will continue, remains to be seen. There's a couple of panels about halfway through that suggest that the real Peter Parker is not quite dead and buried - I actually missed it at first, but spotted it in a re-read - it's quite subtle, and bravo for Slott and Stegman for sticking it in there that way. I cannot wait for what happens next, and the presumably final showdown with the Goblin King.