Caitlin and a friend are standing on a mountain when they see a huge fireball shoot across the sky and fall to earth. Has a plane exploded? Caitlin checks, but there are no reports of missing planes. When another friend reveals that she also saw the fireball, the kids begin to wonder if an alien space- ship has landed! 
Caitlin and her friend ride out on horseback to search for evidence. But as darkness falls, they start hearing strange noises and notice eerie fingers of light in the underbrush. Something is there, but 
what?