Through the Doors

What if there was a door that led to another universe? Not just one door, in fact, millions. Each door leading to a new universe and each universe containing a new door. At the age of twelve the Lessers are forced through the doors, to find whatever lies on the other side of the last door, and bring it back.
When Coraline goes through the doors she is plunged into worlds infinitely different from hers. As she battles to get through each door and into a new world, secrets about her world and her mission begin to reveal themselves, and Coraline must decide what is good, and what is not.