At the age of thirty-nine, Sarah Kowalski heard her biological clock ticking, loudly. A single woman harboring a deep ambivalence about motherhood, Kowalski needed to decide once and for all: Did she want a baby or not? More importantly, with no partner on the horizon, did she want to have a baby alone? Once she revised her idea of motherhood--from an experience she would share with a partner to a journey she would embark upon alone--the answer came...