That Mainwaring Affair (1900) is a novel by Anna Maynard Barbour. Excerpt from the book: 'Hugh Mainwaring, the sole heir to the family estate, soon after the death of his father, some twenty-five years previous to this time, became weary of the monotony of his English homelife, and, resolved upon making his permanent home in one of the large eastern cities of the United States and embarking upon the uncertain and treacherous seas of speculation in the western world, had sold the estate which for a number of generations had been in the possession of the Mainwarings, and had come to America. In addition to his heavy capital, he had invested a large amount of keen business tact and ability; his venture had met with almost phenomenal success and he had acquired immense wealth besides his inherited fortune.' When this man let's his secretary put his will in writing, that starts a different chain of events…