Holmes: You know, I-I'd quite like to go with you next time. To the cemetery. Obviously, the mistake that you made, it, uh, changed the course of your life. The man seems to have left quite an impression, as well. I'd just like to pay my respects.
Watson: I'd like that.
Holmes: You don't think it the least bit coincidental that both you and young Mr. Castoro decided to visit the cemetery the day after his father's birthday?
Watson: Yes. Of course I do.
Holmes: But you still want to give him the money.
Watson: It's complicated. You don't know him.
Holmes: I also know, as does he, that you blame yourself for the man's death.
Watson: Because it was my fault.
Holmes: It was an accident. And as loathe as I am to admit it, accidents happen. Joey's goodwill obviously means a great deal to you. But the fact that he has on more than one occasion attached a dollar figure reveals his character. Or at least it does to me. I'm an expert on poisons, Watson. I know virtually everything there is to know about them. But I've come to learn over the last few years that there is nothing on this planet quite so toxic as guilt.
"Lightning Rod" by Erin Doherty
"Guitar Between Us" by Chloe Kat
"Sea of Air" by Portugal the Man (last scene)
Special billing was given to Aidan Quinn (and) for this episode.