House of the Dragon episode 4 sets up one of the most disturbing storylines from the book

gamesradar.com:

House of the Dragon episode 4 sets up a particularly disturbing storyline from George R.R. Martin's Fire and Blood book. The episode focuses on the return of Daemon Targaryen to King's Landing, along with Otto Hightower's plotting, and the search for a suitable husband for Rhaenyra Targaryen. 

Before you read on, though, you should be warned that we'll be going into major show and book spoilers, so turn back now if you don't want to know where House of the Dragon might be headed! 

Still here? Then let's get into the spoilers. In episode 4, Daemon invites his niece out to King's Landing after dark, both of them disguised as commoners. To sneak out of the Red Keep, though, Rhaenyra needs to use a secret passageway that she had no idea existed – Daemon draws her a diagram to reveal its location. The hidden passage leads all the way to the outside of the Red Keep, and from there, the duo head down to the streets. 

But, as one Redditor (opens in new tab) points out, this scene could be setting up a major event from Fire and Blood: Blood and Cheese. That storyline sees a rat catcher known only as Cheese team up with a butcher using the name Blood. Together, on the orders of Mysaria, who herself is working for Daemon, they sneak into the Red Keep via a secret passageway which leads them to Alicent Hightower's bedroom. There, they tie up Alicent and await the arrival of her daughter Helaena, who has only just been born in the show (see a picture of her above). Helaena is married to her brother Aegon – the toddler seen in House of the Dragon episode 2 – and together they have two sons, the youngest named Maelor and the oldest (and heir to the throne) named Jaehaerys, along with a daughter. 

This is where the story takes a