Is it normal behavior for a dog to bark in a corner

My dog does this because there are rats in our house and she can hear them scurrying around. It's actually quite effective. She's helped me get multiple rats out of the house by cornering them and barking until I catch them in a box and set them free in a field

Maybe you have a spirit in the house. Dogs pick up on those better than humans.

Probably a pervert with technology that makes him invisible.

Maybe there's a weird bug, or a ghost?😨

Dogs have very good senses. She is trying to tell you something. Maybe she smells mold or something?