glanced at Ruth and noticed her eyes

"Look," Tommy said. "It's their lunch break, but they don't go out. Don't blame them either."
We kept on staring, and it looked like a smart, cosy, self-contained world. I glanced at Ruth and noticed her eyes moving anxiously around the faces behind the glass.
"Okay, Rod," Chrissie said. "So which one's the possible?"
She said this almost sarcastically, like she was sure the whole thing would turn out to be a big mistake on his part. But Rodney said quietly, with a tremor of excitement: "There. Over in that corner. In the blue outfit. Her, talking now to the big red woman."
It wasn't obvious, but the longer we kept looking, the more it seemed he had something. The woman was around fifty, and had kept her figure pretty well. Her hair was darker than Ruth's--though it could have been dyed--and she had it tied back in a simple pony-tail the way Ruth usually did. She was laughing at something her friend in the red outfit was saying, and her face, especially when she was finishing her laugh with a shake of her head, had more than a hint of Ruth about it.