Erica Powell was Nkrumah's secretary and penned a book on him yet his mention of her was inconsequential with the exception of Milne's compilation of correspondence.  In that compilation Nkrumah advises Powell not to write about his thoughts because she did not really know him.  Powell waited until Nkrumah passed and did as she pleased.  Generally, Powell's work was a self-glorifying text of her experience.  It did offer, however, a contextual vision of the European expatriates in the employ of the Ghanaian government during the First Republic.