The words are boring, the letters are unhappy, the punctuation marks are well pissed off, so the last full stop needs to sort things out.
There's a crisis in the language and letters are not very happy, they want better words, sentences, but all they are offered are Acronyms and Abbreviations and only capitals get those jobs.
So Stopper the full stop in the title is asked to investigate why the language is not educating , elucidating, and expanding, which is its remit.
Stopper is assisted in this quest by Zero, an italicised u, 3 commas and various other characters. As the investigation proceeds, Stopper and co find themselves sucked into the story, The story that takes them from one subconscious where the language use is a bit ropey, through the unconscious and the Scream of the Amygdala.
Then into a second subconscious where language is completely controlled in Acronym City, then onward into a second unconscious to meet the sardonic Hypothalamus, and then on to the final subconscious where the final battle for the freedom of the language is engaged.