Carl and Anna are dreading the summer. Their cousin Bailey is supposed to stay with them and Bailey is not a good kid. They let their friend Ingrid know that the summer will not be a good one. They decide that they will form a club that does not include Bailey, The Vikings.
Bailey comes and doesn't like the fact that the three have formed a club that does not include him. He pulls some pranks on them. They are not pleased.
Bailey stays in the attic with Carl and decides he will draw on the wall, since he does not have a window on his side. The window comes alive and Bailey is able to enter into the world that he has drawn, as if through a window.
The summer becomes more exciting, as Bailey draws more windows and the children travel through. Each one becomes its own adventure. ( )