"I'll get it." Charlotte tried to call through the wall, while still being quiet so the door wouldn't get scared.  She put her wand away, not wanting to make it feel nervous, and started to tiptoe down the hallway.  There were a lot of doors, and the ghost wasn't helping much, so Charlotte had to try to figure it out on her own.  It was like a riddle in a fairy story, she thought.  

So, which door was a good candidate?  Most of them were pretty evenly spread out.  But there was a pair of doors that were about an inch apart.  That was suspicious, and as she crept closer, she saw that the door was also shivering a little.  That was a sure sign, right?

When she was close enough she suddenly lunged forward and grabbed the knob.  "Aha!" she said, but her triumph was taken away quickly as the door sped along down the wall.  She kept her grip on it and was forced to run alongside, lest she be dragged by the fleeing door.  The other doors in the hallway jumped up and flattened against the ceiling to get out of the way.  

Charlotte's face scrunched up in determination, she dug her heels in and yanked on the door handle.  She got it to hold still long enough to try to reason with it.  

"It's okay," she murmured gently to the door.  She hesitated for a moment and then stroked the frame with her free hand.  She could feel the door shudder under her hand, and as she stroked it seemed to calm down.  "I need your help... door.  My friend is trapped in a room and you're the only way in and out!" 

"Come on," she pulled on the knob.  There was resistance for a moment, but then the door let itself be led down the hallway.  The other doors jumped out of the way as they had before, and Charlotte led the door back to the blank stretch of wall where Layla was trapped.  When she got the door there, she turned the knob and pulled it open.  And there was Layla.  

"Gotcha!  Now I hide, right?"