The Shepherd Moon

Meredith Ambrose was nicknamed "Merry" by her parents when she was a baby, but now that she can express her own opinions, they find her "boring". While visiting the family estate, she witnesses the crash landing of a strange boy (Mikel Goodman) who comes from the space habitat that Earth now calls the Shepherd Moon. Although those around her do not seem to recognize the danger that Mikel represents with his astounding abilities, she is able to convince her grandfather, the powerful General Ambrose, that Mikel is indeed a threat. In the 48th century, Earth has all but forgotten that the miniature "moons" that accompany Luna were the cause of the collapse of Earth's high-tech civilization and are still inhabited.