‘The Undoing’ Episode 5 ‘Trial by Fury’: Does Henry know a ‘secret’ about Jonathan that Grace doesn't?

WARNING: Spoiler Alert for ‘The Undoing’
The details of the chilling crime in ‘The Undoing’ and the killer seems to be too complicated to fathom. Towards the end of Episode 4 ‘See No Evil’, Jonathan Fraser (Hugh Grant) agrees to a TV interview and confesses he ran because he was in shock. He also thought he was indirectly responsible for the murder as someone could have done it in a fit of jealousy or rage over their affair. “Let's not forget that in all this I lost someone I love,” he admits. When he is asked if he has some idea of who did kill Elena, he takes a pause before saying, “I do, yeah.” Who is the killer and how does Jonathan know?
In a 35-second clip for Episode 5 ‘Trial by Fury’, the Fraser family is dining at a restaurant after the trial when Henry says, “I think we're going to win. Do you?” Grace and Jonathan's lawyer Haley Fitzgerald (Noma Dumezweni) advises them to be supportive of each other. She says, “The jurors will be studying you for signs. If you two don't feel it, neither will the jury.” She then asks, “Are you devoted, Grace?”

In another scene, Jonathan asks Grace, “Why were you there that night? Outside her apartment?” Shocked, Grace remarks, “What are you asking me?” The teaser ends with a mysterious frame where Jonathan is seen under the covers. The summary reads: “On the first day of the trial, the prosecution presents shocking evidence, while the defense casts doubt on the police investigation. Later, Henry (Noah Jupe) divulges a secret to Grace (Nicole Kidman).”
What is Henry's secret? Does he know something Grace doesn't? Pointing out how his actions seem mysterious, one fan said, “All that anger Henry had for his father in jail has magically disappeared. I don’t trust you lil boy,” and another posted, “And Henry knows something idk what but he just does... TRY TO CHANGE MY MIND.” A third chimed in, “Jonathan is protecting someone and now I think it might be Henry.” But a fourth pointed out: “It’s like they want us to think it was Henry. He being weird #TheUndoing.”
All that anger Henry had for his father in jail has magically disappeared. I don’t trust you lil’boy #TheUndoing
— Summer (@Wemi_Esho) November 16, 2020
And Henry knows something idk what but he just does TRY TO CHANGE MY MIND #TheUndoing
— King of the Lab 🥼👨🏼🔬 (@rsquint447) November 16, 2020
Jonathan is protecting someone and now I think it might be Henry #TheUndoing
— Rachie🌻 (@songbreezie) November 16, 2020
It’s like they want us to think it was Henry. He being weird #TheUndoing
— nisha (@nishaimanb) November 16, 2020
Directed by Susanne Bier and written by David E Kelley, the next episode may finally reveal some huge hints and clues for the final showdown. Perhaps, the biggest shocker could be how Henry is connected to the crime that shouldn't really have involved him.
‘The Undoing’ premiered on HBO on October 25, 2020, and more episodes in the six-episodic series will air every Sunday from 9 pm ET to 10 pm ET. Catch the fifth episode ‘Trial By Fury’ on November 22, 2020.