The Breaking Point by Mary Roberts Rinehart
Public Domain Books, n.d. (originally published 1922); 311 pages
Classic Rinehart here: mistaken identity, amnesia, public scandal, mysterious deaths, true love, and changed lives. In some ways this was like a Grace Livingston Hill novel, except without the exceedingly legalistic religiosity. The ending was not quite fulfilling. It ended exactly the way I wanted it too, but rather abruptly and without details or flourish.