La Niña Perdida by Elena Ferrante

A narrator traces a lifelong, fraught friendship with a brilliant, mercurial childhood companion in a poor Naples neighborhood, following their diverging paths through love, marriage, work and motherhood amid social change and political violence; rivalries, resentments and hidden choices accumulate over decades, culminating in a baffling disappearance that forces the narrator to reassess how their shared past shaped both of their lives.

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