Crackers at Miss Jo's

There was nothing to eat but square Ritz crackers. Rock and his mother were at the house in Nashville, Arkansas, that belonged to Jo Baker, or Miss Jo as Rock had known her since the 1960s, but she was apparently out of town.
Rock was hungry, and his mother told him he could eat anything he wanted.
"Have you ever seen square Ritz crackers?" he said.
"I've never even heard of them," his mom said. "I wonder where she got them."
There were slices of ham and small chunks of cheese on sandwich plates all around the kitchen.