Marvin Redpost - Kidnapped at Birth 1 Author:Louis Sachar Marvin Redpost suddenly figures out why he has red hair & blue eyes, while everyone else in his family has brown hair & brown eyes. He's not really Marvin Redpost at all. He is Robert, the Lost Prince of Shampoon! Soon his friends are treating him like royalty. Now all he has to do is break the news to his "parents."