Zoe shrugs, and she slips the book she was borrowing into her brown leather purse before reaching up to put Devereaux and Daniels in the right places and tucking Burnett under her arm. "Not really," she says. "I'm only a Four, we don't have that much responsibility." Which is true as a general rule.

Just not in Zoe's particular case. She'll just work a little later tonight, that's all. "This one goes in the aisle before this one, I think," she adds. "With all of these," indicating all the As and all the Bs, "so maybe we should pull the cart that way?"