What is the theme of "The Blind Spot"?

Only two characters appear in the story: Egbert and his Uncle Lulworth. They discuss three other characters: the married couple Peter and Alexandra, who were Egbert's aunt and uncle, now both deceased, and Sebastian, a chef who now cooks for Uncle Lulworth. The man is apparently a gourmet, as he does not want his lunch interrupted.
Egbert finds himself shocked and distressed by his uncle's attitudes and actions. He has brought a letter with information that might indicate that Sebastian had killed Peter. Lulworth had burned the letter because he valued the chef's skills.
The theme of egotism seems paramount here, as Lulworth rejects something important because it might interrupt his sensory pleasure; his satisfaction is more important than finding out what happened to his own relatives.
Of course, as the story ends at that point, we do not get to see what develops. Perhaps Lulworth was behind Peter's death. It may be that Lulworth truly did value the chef more highly. If so, hypocrisy could also be a main theme.