Christina is never allowed to leave the grounds on which her home stands, a protective measure of her father's doing after her mother was killed in an explosion. Then a chance meeting with Taft, an orphan who picks up garbage, causes her to once again look for a secret tunnel entrance in the old mansion. The tunnel she locates in the attic leads her to the orphanage and the children she is forbidden to meet. But Christina is intrigued with Taft and she rescues him and takes him home to be her partner in exploration while she hides him in the attic. When Christina finds a test tube with a message inside that indicates that her mother may still be alive and Taft's friend Danny from the orphanage is put on a truck for the mountains, the two begin to search for those they care for and what the mysterious element zoom has to do with those they care for so deeply. The search calls for them to earnestly believe in the unbelievable, the secret of zoom.