The Beckoning Lights

When Jack and twin sister Julia go camping with their father and some of his students, in the foothills of the Rockies, they expect to have some interesting times, but not to find a UFO. The aliens can communicate only with the twins, who are telepathic, and they ask their help in finding a substance essential for the aliens' survival. For the first time Julia must face up to her deepest fears – or abandon an alien race to death. Meantime, the other students react in different ways to the supposed threat from outer space.