Before reaching Mjoll I stopped at the tavern I had dismissed Rayna at and to my surprise she was still there! Got me thinking that I could/should start building up an army for the impending war against the Thalmor and/or the falmer so I took her to my house in Solitude where she was happy to keep Njada and Jordis company. Anni the elf archer and Wynna the mage soon followed suit, though Wynna helped me retrieve a number of dwemer cogs for a dude at the mage academy first, and slay the thief-allied mage there while we were at it.
At Skyhaven Temple Mjoll agreed to join me but there was something she had to do first (she wasn't following me) so I watched as she and spy-gal Delphine went to the outer courtyard, saluted and began to spar. At least I thought it was sparring - until Mjoll sliced Delphine's throat with her axe! With Delphine dead on the ground we were off next to fight an ancient dragon for Esbern. This one was particularly nasty but Athis, Mjoll and I took it down all the same. Ofcourse now that I knew Athis was turning into a draugr I couldn't let him live and yelled him off the mountain.
Next stop was the Nightingale Sanctuary where I let Mjoll duel Karliah (a battle she won easily) before storming the Ragged Flagon in Riften itself. In the bloody combat that followed, every single thieves guild member save for Brynjolf (protected by threads of fate) were slain and looted, but our task wasn't done. It was evening time when we returned to the surface and we found the imperial-loving, thieves guild supporting Lady Black-Briar at the tavern. I used a mayhem scroll to make the fight seem natural and managed to kill her and her husband in the melee. Somewhere during this Mjoll ran outside the door for some reason and that was the last I saw of her. She was gone without a trace.
The guards of Riften were mainly in the Black-briar pockets so I did not hesitate in slaying every single one that dared get in my way, as well as a bunch that wanted to hide in the barracks and castle. I made sure to visit just to check who would and who wouldn't attack. Now I know which are my friends, since all my enemies are dead.
Or so I thought.
I completely forgot about the god-damn Batman.
Good thing he's not in this game. :P