Journey trilogy (Aaron Becker)

Using a red marker, a young girl draws a door on her bedroom wall and through it enters another world where she experiences many adventures, including being captured by an evil emperor.

Failing to get the attention of her busy father, a lonely girl turns back to a fantastic world for friendship and adventure. It's her third journey into the enticing realm of kings and emperors, castles and canals, exotic creatures and enchanting landscapes. This time, it will take something truly powerful to persuade her to return home.