Eliza is a former fiction writer-turned-mom-blogger with her own site, "The Bjorn Identity." Taking place in a single day in Eliza's life that nearly pushes her to the tipping point, which includes preparing for and throwing her daughter's 6th birthday party, minding her toddler son, and navigating playground politics with overbearing moms. On top of it all, Eliza decides to enter a contest run by an upscale parenting magazine. All she has to do is write 500 words answering the deceptively simple question, "What Does Motherhood Mean to Me?" In the process of trying by nightfall to put these thoughts into words that don't "sound like bad ad copy," Eliza rediscovers her own voice and realizes what is truly valuable in her life.