Lucy knows every corner of her house. So when a small blue door appears in the hallway, she knows it was not there yesterday. No one else can see it. Each time Lucy opens the door, a different impossible world waits beyond: a moonlit beach, a forest of walking trees, a library in the clouds, and a city hidden inside a giant clock. Then Lucy spots a trapped boy who begs her not to close the door. Too late. To find him again, Lucy must follow the clues he left behind and discover what the mysterious door is really searching for before it disappears forever. A visually rich mystery adventure about curiosity, courage, and finding the person who needs you.
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