The Secrets She Keeps by Michael Robotham

Two women from very different lives—one outwardly successful and pregnant, the other working-class and desperate—become dangerously entangled when secrets, lies and obsessive fixations begin to surface; told in alternating perspectives, the novel slowly peels back layers of deception about motherhood, identity and past trauma until their intersecting choices lead to shocking, violent consequences and a final, unnerving revelation.

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