Wilkerson had had such a moment about an hour earlier, when Ron Agua, whose office was across the hall, had waved to her as he walked past her door"I'm off to the Rat," he announced. "Come join us if you ever get free." For a moment Wilkerson had stared blankly at the student before her, pondering the scene at the Rathskeller, the university's most popular restaurant meeting place. Agua would be there with four or five of the department's senior members, including Alice Bordy, the department chair. All would be glad to have her join them if only she didn't have so much work