Our three main characters in this episode are Sofie, Hubert and Irma. Sofie and Hubert are mother and son. Irma is Hubert's girlfriend. I'll be the first to say this is another episode I thoroughly enjoy but I feel like a lot of people might be dismissive of it.
Hubert is the opposite of William Shatner's character where he also has mommy issues. That character enjoyed his life and enjoyed being eerily close to his mother. That character was also warned that the only way he'd get his freedom would be after the death of his mother. Again, that character enjoyed the way his life was turning out. Hubert isn't that way. Hubert seems irritated by all of it. Yes, he's irritated but not enough to lay down the law to mommy and say he's an adult and he'll be moving out and having a life of his own.
There's some murkiness on some of the details. Hubert sounded like he did have a job but it's unknown if he quit of his own free will, was fired or if mom made him give up the job. I say all this because Hubert doesn't have a checking account. Sofie doesn't want him having one. Sofie's the one handling the finances. Again, Hubert looks irritated more than anything.
Some talk rolls around to Hubert's deceased father. Sofie's a believer in being able to contact spirits and she's worried if her dead husband is okay or not. Hubert's rather dismissive but all this talk leads Hubert into getting an idea. Sofie had revealed she still has some of the medicine that Hubert's father was taking and it sounds like she's totally open to the idea of overdosing on the pills in order to reunite with her husband. Hubert takes all this and ropes his actress girlfriend (Irma) into "contacting" the spirit of Hubert's father so the "spirit" can reveal he's lonely, wants to be with Sofie again, etc. Irma plays along to begin with and puts on this charade. But later on she has a moment of clarity and tries to confront Hubert that what he's doing is wrong, you're talking about murder, etc. Hubert won't have any of it and basically tells Irma she's just as involved as he is.
Meanwhile, Sofie's ready to take her own life to reunite with her husband. But Sofie seems to be taking a long time and Hubert's very impatient. She's wanting to make sure all her affairs are in order. Hubert's ready for his freedom but he's not going to get it. Hubert proposes a toast dedicated to his father and he's assuming that Sofie would naturally drink her own poisoned drink to honor him. Instead she finds an excuse to not drink while she's looking rather curiously at Hubert. Hubert's starting to feel funny and that's when Sofie proudly boasts she's poisoned Hubert! Sofie absolutely wasn't going to let her son be in life alone without mommy and daddy! Hubert dies and Sofie hears police sirens that prevent her from drinking her own poisoned drink. Irma was trying to right the wrong she had done by alerting the cops to what Hubert had planned.