Book One: The Shadow Door (The Elsewhere Chronicles)

It's bad enough when Max, Rebecca, Noah, and Theo just think Grandpa Gabe's house is haunted. But then the old movie projector in the library opens a passageway to a world of monsters and creatures made of shadows - a place of secrets and dangers set loose when the sun sets. The only weapons to fight them lie in the land on the other side of the Shadow Door. . .