Sometimes Stokes was there, looking anxious, particularly when in the queue he saw plantation-hands from St. Swithin’s, who were supposed to remain in their parish under strict control, to test the value of the phage.
There are no more uses of "queue" in the book.
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"There’s usually a queue on weekdays.
Gayle Forman -- Where She Went
In the event that she was stumped, she could bounce the query to his own queue, and he’d take it.