A 12-year-old girl named Bea moves to her grandmother's New York apartment while her father recovers from heart surgery. She uncovers a hidden world of imaginary friends and sets out to reunite them with their original children, including herself. Along the way, she discovers the transformative power of imagination, the value of family, and the healing properties of friendship.

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A child's traumatic event unleashes a chain reaction, exposing a hidden realm of abandoned imaginary friends who were once brought to life by their childhood companions.