Two brothers, Henry and Oliver, are forced to live with their grandmother after their parents mysteriously disappear. While exploring their new home, they discover an entrance to a network of forgotten tunnels underneath the city. Aided by their spunky new neighbor, Molly, and their Goldendoodle, Chewie, the boys begin to explore the tunnels. When they discover a connection with their grandma's house and an unsolved robbery that occurred one hundred years ago, they realize that all is not as it seems, and the tunnels may not be as forgotten as they first believed.
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