The central idea of this paragraph is the clever ways a female spy used to communicate with prisoners, which is supported with examples about how she used books.
The topic or subject this paragraph is about is spy and communication with prisoners.
The central idea are the clever ways a female spy had to implement to communicate with prisoners.
The detail that points this is the detail "Van Lew found..." because this detail directly focuses on the creative ways to communicate.
Moreover, this sentence is supported by the details of how the spy used books to communicate.
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