Burned out and broke, twenty-two-year-old single mother, Anna Jennings, moves back to her grandparents' rural home for the summer with her four-year-old son, David, in tow. Living next door is Jamie Presswood, Anna's childhood friend, now much more handsome and hardened than she remembers. Jamie reminds her of simpler times—Ferris wheels and sparklers, picnics and Neapolitan ice cream—long before she met her unstable ex, and everything changed. But the sudden appearance of shadowy dinosaurs awakens Anna from her small-town spell, and forces her to realize that she's either lost her mind or can somehow see her son's active imagination. Frightened, Anna struggles to protect David, but what she uncovers along the way is completely unexpected: revelations about what her son's imaginary friends may truly represent, and long buried secrets about her own childhood.