The story follows Millie Price, a fiercely ambitious teen who dreams of becoming a Broadway star. When her single dad tries to rein in her plans, Millie takes matters into her own hands. After stumbling upon her dad’s old LiveJournal account, she sets out to uncover the identity of her birth motherwhom shes never known. This leads to a whirlwind of misadventures as she narrows it down to three possible women, each offering a glimpse into a different life she could have had.

Meanwhile, Millie navigates auditions, friendship drama, and a hate-to-love rivalry with Oliver, her quiet, infuriatingly organized classmate. As Millie chases her dreams and digs into her past, she begins to learn that familyand finding yourselfis often more complicated, and more beautiful, than any script.