This is the title of a novel by Olaf Stapledon
It is about a new and superior kind of human being born in the present - Olaf Stapledon's present being around fifty years before ours at the time he wrote this book. His parents are human like us, but the implication is that the recombination of their very different virtues creates the seed for something new. In some Odd John seems oddly slow at first, because he doesn't understand some things that ordinary people understand about each other instinctively. Soon he becomes clever enough to control those around him - and to become bored with it.
Although this is in some ways a utopian novel, it also reflects Olaf Stapledon's deep frustration with humanity and the wars of his era, and peoples failure to be what they could be. John is not good in a conventional sense, and some of the things he does will horrify you. There is a strong sense his upbringing among modern people has warped him somehow, although I can't help think a truly improved human being would deal with this world better than the best of us.
Although this is not the best known of the author's novels, it has a fascination about it. It makes you think strange thoughts, as the best science fiction is able to do. Science fiction was not the genre it is today when Olaf Stapledon wrote, and this book is never quite what you are expecting. It makes you think strange and uncomfortable thoughts about Odd John, about humanity, about Olaf Stapledon, and about yourself.