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"Dual identity" as a book category centers on characters who live with two distinct selves—whether literal (a secret agent, superhero, undercover operative, or someone in witness protection) or psychological/cultural (an alter ego, dissociative identity, or person straddling two cultures/languages). Stories in this category explore the tension between those identities: secrecy and deception, the practical and moral consequences of leading a double life, and the emotional struggle for authenticity, belonging, or reconciliation. Narratives often hinge on revelation and suspense—hidden pasts, slipping covers, unreliable perspectives, and moments when the two selves collide—and can be told as thrillers, literary fiction, romance, YA, or speculative work. Common motifs include masks, aliases, mirrors, and crossroads; the payoff is usually a transformation or crisis that forces the protagonist to choose, integrate, or be undone by their duality.

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