By the end of episode 3 I was left puzzled.
Anna has hooked up her house with recording equipment. She has the goods on her husband Jake and and the nanny Becky.
Anna can ruin Jake's life as a lawyer already. There is proof of Jake's plans to set up his wife as unstable and not a fit mother.
Once his career is in ruins, I doubt Becky will stick around. Really end of story. Anna can take her husband to the cleaners in a divorce settlement. There really is no need for another episode.
Then again why would a young woman like Becky want to hang about with a gaslighter like Jake. Raise his two kids from his first wife when she would rather have her own kids. She would probably prefer they were packed off to England as well.
So Anna sets up her revenge. She insinuates that Jake can be violent to Becky. Something Jake denies when Becky raises the matter. Of course as he is planning to get his wife out of the picture. That's ok with Becky then.
It is all silly and preposterous.