***The following is review/breakdown followed by a detailed recap of episode 303 of FROM, “Mouse Trap,” and it contains spoilers for the episode.*** 
Although there isn’t as much heartbreak in the episode this week, the plot is still moving fairly quickly. It’s clear from the beginning of the episode that the town is still screwing with everyone, in this case, Jim. I don’t think Jim would have any reason to believe anything different than that is their intent. Even if his son Thomas were still alive, he would not be old enough to call him in the first place, though this clearly would still be painful for him. The voice basically threatens his other children as well, of course, which makes it all worse. I appreciated though that he’s not listening to the voice and brushed it off quickly. I do think the person (?) on the other end fulfilled their purpose, however, because Jim is becoming very irritable and snapping at his children, whether he believes it or not.
A big part of the episode is what Boyd is planning, wanting to capture one of the monsters, which he mentioned to his son in the last episode. The biggest problem with this is he has no plan. We know the town is trying to break him, and it seems to be working somewhat in the sense that it’s getting him to act rashly, but thankfully, at least for the time being, his son and Donna seem to have calmed him down. This thread is picked back up, however, towards the end of the episode when he goes onto the bus with Randall and intends to watch the creatures. Hopefully he will watch them first and then formulate a plan before he follows through with trying to capture one.
As an aside, I did also want to mention that two people in the episode, Jim and the bus driver, asked Boyd if things were going to get worse, which makes me think there is a good chance that they probably are.