Are you fascinated by twins? I know I am, and in pop culture, twins have always occupied a unique space. When Leah Dieterich began researching Vanishing Twin Syndrome, a gestational illness in which one fetus absorbs another fetus, she realized that this idea really resonated with her as she approached nonmonogamy in her marriage. Intimate memoirs are sometimes difficult to pull off, but Dieterich’s marriage with Eric and partnership with Elena is really captivating.

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