Frank Lake began writing this book as he was dying from inoperable cancer in the spring of 1982. This book is the third and final work in a trilogy on the prenatal origin of human personality and is now being published for the first time. As Lake writes in his introduction to this manuscript, he believed that this third and final book was needed to tie up some loose ends and bring closure to his life’s work. All three books address the issue that Lake had become convinced was the most important one for any adequate understanding of human personality formation and function. It is in this final book that Lake’s thoughts take their most direct, and perhaps most radical form. He asserted that not only is the origin of human personality, and consequently psychopathology, found prior to birth, but was likely formed within the intrauterine dynamics of the first three months of pregnancy.