First off, there is so much to this play it's hard to remember it all, but it's a doozey.
There are nobles who hate other nobles, who snipe, bait and target each other. Some end up with their heads cut off for no real discernible reason. A really good guy is strangled in his bed. And the bishop, Winchester, who's okay but not a great guy, he's poisoned. The noble who sold out England and gave back to two huge territories to France, and also brought back Margaret of Anjou, a French princess, for King Henry VI to wed, AND who is having an affair with her, ends up with his head cut off by pirates. Later we see poor Queen Meg carting his head around. She's a bit upset.
There's also witchcraft and conjuring by Eleanor, the wife of the good Duke of Gloucester. (He's the guy who gets strangled in bed.) On top of ALL THIS, there's Richard of York plotting to be king and standing around watching all this nonsense go down. He's also abetting it and laughing at it and enjoying it all because every time a noble guy dies - who might be Richard's enemy - it's one more bowling pin tipped over in Richard's plans to bowl a strike - and be king!
(I looked up the genealogy charts for this time, all the descendants of King Alfred the Great who ruled back in 800-something. Both Richard of York and Henry VI descend from him and both have a pretty equal claim to the throne. It all depends on how you look at things.)
Meanwhile King Henry VI is a nice enough guy but he prays too much and is sort of too good. He forgives ANYBODY who is nice, really. He also believes ANYBODY who pledges their allegiance and says to the king, hey, sorry I screwed up, can we be friends again? Henry is a real doormat, but this also works two ways because...
If someone comes along and says Ho, there king, you need to arrest - fill-in-the-blank - because he's been heard to say or do something that isn't all that loyal, well then, Henry will believe this! He'll have 'fill-in-the-blank' taken away just on someone's say so! But then he'll whine a bit about how he feels that 'fill-in-the-blank' is really good and how he doubts himself and boy, is Henry a first class waffler. I wanted to slap him from here, 400 years after all this was written.
There is another 'meanwhile' going on, and that's trouble among the commoners. They're all riled up and mirror what's happening with the nobility. They love the king; they hate the king. They love Richard, who's supposed to be king - if you're a white rose-leaning Yorkist - and they distrust almost everyone who is learned or can read and write. (They actually kill a guy because he's 'learned.' This is the play with the famous line, 'First, kill all the lawyers.') John Cade is their leader and he's a first-class moron who kills anyone he just does ... not ... like.
By the way, this is an ongoing theme throughout history: fear and hatred of those who aren't necessarily richer than you are, but SMARTER than you are. If it were me, I'd be going around saying nope, nope, have no idea what a noun is, or a verb. Is that a name? Does Noun own the winery and Verb's his comely daughter?
Seriously, there is a passage where they curse anyone who knows what a noun or verb is. I am NOT kidding.
Well amidst all this turmoil a country needs a strong leader. One who can say, hey you nobles, knock it off, or hey, let's have a tournament and let the country folk burn off some steam. Also one who'll say nope, France, you cannot have Maine and Anjou back, it sets poor precedent. As well as a king who won't restore a man's titles and estates at the drop of a hat. (Henry actually does this in Henry VI Part 1, but it has repercussions through to this play.) This really shows Henry's inherent waffling because who restores someone who, 1. had a dad for a traitor, and 2. some of your best advisers are telling you WATCH OUT FOR HIM?
This is an entire play of arguing and backbiting. Betrayal and conspiracy. Beheadings and armed masses running around. Throw in some witchcraft, a tiny bit of humor, a spineless ruler, two women who are as bad as any deceitful man, and this is a play that must have had the crowds cheering.
Masterful. Loved it.