He's using the Brideshead characters in law school exams.
Which reminds me that I have a case now where one of the opposing lawyers is named Kara. The first time we spoke on the telephone, I had to ask, is that Cara with a 'C'? Back at the office they laugh at how easily I am distracted by obscure matters of this kind. (Cara was Lord Marchmain's mistress, an intimidating and mysterious figure to young Charles Ryder when he first went on holiday to Venice.)