This is a good story, but departs so drastically from the biography by Anya Seton, entitled My Dearest Theodosia (Houghton, Mifflin -- March 7 -- see page 15) -- that it makes one wonder how two such interpretations could be made from presumably the same source material. This biography goes farther back into the childhood of Theodosia, tells nothing of the love affair with young Meriwether, paints her marriage to Alston as a very happy one, and shifts the focus completely.