The Heart of Rachael — Kathleen Norris

This 1916 bestseller is set in a wealthy enclave of Long Island, New York. Rachael, the depressed wife of a rich and fashionable man, finds a promise of happiness after a period of suffering and doubt, but must do the unthinkable -- divorce and remarry. However, the troubles do not end there, in the book the New York Times praised as Norris's "best and most careful work."