Headquarters

The headquarters was owned and designed by Luke Wilson. Nina remembered the first time she set foot on that underground facility. 

Outside, it was a simple house near the ocean, wooden walls and ceilings complete with furniture. But inside, there was a secret door behind the fireplace with a stair going to the basement. 

It looks like a dead-end at its rear, but a door suddenly opened when Luke spoke, leading them to an elevator. It was an underground facility. The girls were obviously not aware of the place, so they were surprised. The boys were the only ones who knew about it.