Ally is happy married to Luke, but she and her sister Miranda couldn't be more different. While Ally has four children and a cozy home life, Miranda is child-free, married to a millionaire, and living in an astounding show home. Ally gave up trying to compete years ago, so she is shocked when Miranda asks her if she will help provide the one thing that is missing from her perfect life: a baby. Ally has every sympathy for Miranda's infertility problems, but she wonders if she can have a baby and hand it over to someone else, even if that person is her own sister.