Ever since the family moved in, they have always admired what they thought was a built-in bookshelf.

But when one of the children pulled on the bookcase, the "built-in" moved, revealing a deep, dark secret.

A spiral staircase leading into who-knows-what.

They decided to venture down, not expecting much. But they were so, so wrong.

This crawlspace was about halfway down. It looked empty, but if you crawled in...

Someone was living there. In their walls. In fact, that's the one brother's Halloween candy. Whoever it was living there must have snuck into the house and brought back the loot.

Here are the things that they had with them. This elephant was hidden under the blankets.

A key to something unknown.

And the creepiest dolls ever seen.

Needless to say, the two brothers called the cops and there's an investigation looking into this. I don't know if I feel safe in my own home anymore... Wow.