The irony is that they are smiling with “torn and bleeding hearts”.
The idea it emphasizes is that they are smiling to hide their pain.
The overall message revealed by the irony is that they are in considerable emotional turmoil and faking happiness to mask their distress.
Books represent humans because there is a load of possibilities, anything can happen, and life is always something new.
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<span>“Metonymy” is best defined as a figure of speech in which </span>one noun is substituted for another with which it is closely associated
D. "this was an uneasy secret..."