Oskar decides that he'll meet all the Blacks alphabetically, "from Aaron to Zyna" (5.4).
It takes him three hours and forty-one minutes to walk to Queens, where Aaron Black lives, because he's afraid of public transportation. (He's going to have a heck of time getting to Azkaban to meet Sirius Black…)
He makes it to Queens and rings the bell for A. Black's apartment.
Oskar asks if the man knows Thomas Schell, and the man says "no" and gets him off the buzzer as quickly as possible.
This upsets Oskar, and he cries for a bit, then rings the buzzer again.
He tells Aaron Black that his Dad is dead and he wants to find where his key goes.
Unfortunately, he can't show him the key. Aaron can't come down the stairs (he's hooked up to machines) and Oskar's too scared to go upstairs that high.
Oskar goes to Abby Black's apartment, which is in the narrowest house in New York, according to a plaque on the door. (Maybe the guy from Up used to live there…)
Abby's very beautiful and very sad. She tells Oskar that she's in the middle of something, but he lies to her, saying he's diabetic and needs sugar.
She lets him in, and he makes a mental note to donate his allowance to diabetes research.
In her apartment, Oskar looks at all the artwork in her apartment, like the one of the elephant that seems to be crying blood.
They talk about elephants. Abby puts out a bowl of strawberries and begins to cry. Her husband is yelling, but she ignores him.
She says that she doesn't know Thomas Schell, nor does she know what the key goes to.
He invites her to come to his fall play, Hamlet, and asks to kiss her. (She says no.)
Before he leaves, Oskar takes her picture (we get to see it, and she's facing away from the camera) and he gives her his business card.
He goes to his Grandma's apartment. She's been crying, and she says that she was talking to the renter.
He gives us some quick background on Grandma, like the time he made her panic by hiding from her, how he found the two-way radios in his Dad's stuff, and how she gave him a stamp collection, but he got mad because she tossed out the plate block.
That night, Oskar can't sleep, so he goes into his Mom's room at 2 in the morning, and he asks her what Dad's storage facility was called, hoping it has the word "black" in it.