I was legit terrified that kid was dead on the couch. Yikes.
Cons:
I think Jim, Janice's father, is one of the least rounded-out characters on the show. He kind of exists to be this ultimate threat, constantly hiding in the shadows. And that's... fine, I just always like it better when Barry's own actions directly lead him into danger. And I get that that's happening here, because he murdered Jim's daughter, but I still wish there was a tad more meat to his character and his motivations. A father wanting vengeance for his murdered child makes perfect sense, but what else does he have going on?
Pros:
Everything with Sally and John home alone was... pitch perfect in how insane and scary it was. First the chilling ennui of John's sadness at being left alone with his mother, and Sally's attempts at mothering quickly pivoting into drugging her child into a stupor so as to put them both out of their misery temporarily... God, it was just awful to watch. When Sally was trying to wake him up from the couch and he wasn't moving, I was super scared he was going to die of alcohol poisoning or something. Terrifying.
And then even more terrifying, we've got the figure all in black following Sally around, locking her in her room... I love the way they shot that, because for a split second I thought the figure had slammed the door while inside the room, trapping Sally alone with the mystery person, but then instead it was locking her in. The circumstances of what exactly happened here are completely obscure to me. As John wakes up from his deep stupor on the couch, it's to hear his mother talking on the phone to Barry, leaving a message, asking him where he is. The mysterious assailant could be anything, from a crazy hallucination of Sally's, to vengeance from the guy she choked in the bathroom at the diner, to someone from Barry's past coming to haunt them... it's really not clear, and I love how messy it is. Frankly I was just relieved Sally was unable to figure out how to load a gun properly.