Star Child is about a little boy named Marcus and his ten year sojourn on earth during which time he was a spiritual teacher. The first part of the book recounts his attempts to share his knowledge with the people around him, most especially his mother, who narrates the book. From an early age, Marcus spoke of coming from a distant "green" star where people live in peace and harmony. Marcus spontaneously recalled his own past lives and that of his parents. He explains what happens during the time in between lives, including when we die and how we choose our parents when we decide to reincarnate, all based on his personal experiences. The second part of the book deals with Marcus' "return" to earth, both through his interaction with other human beings and through his reincarnation. After his death, he lovingly continues to communicate with certain people, explaining about the higher dimensions and delivering supportive messages to them in times of need.