The family lives in the mountains of Colorado they just moved there the other week and since then they have heard these tapping on the floorboards at night.
One night the family youngest boy rickbob goes down to the floor and lifts up the boards and finds a door then he tells his parents. The family then goes on a trip to find whats past the door.
The family including Larry (Dad), Sally (Mom), Jerry (Oldest son), Devyn (Daughter), Little RickBob (Youngest son). The family goes into the door and through a tunnel and on the adventure.
They have found the object and taken it to save it but now that they have found the object they have to escape before the tunnel collapses on them.
They finally make it out of the tunnel alive and barely alive. They see the ocean and realize they're on the east coast which is 1500 miles away from there home in Colorado.
The family then realizes that they will be safer and off the grid if they just live in the light house on the shore. When they go into the lighthouse everything they will need for the rest of there life is there.