THE ADVENTURE BEGINS When four new friends stumble upon a cavern at the bottom of a large Baobab tree in the back yard of the Walborgs' foster home, they make a remarkable discovery that sets them on a supernatural journey. Follow along as Ryan, Lisa, and the nerdy twins, Stacy and William solve secret codes, incur the wrath of ghostly pirates, escape demon spirits, encounter villainous thugs, and ultimately discover the celestial land of spirit children. Find out what they learn and see if they succeed in performing the greatest humanitarian mission of all time