She Came Back - Patricia Wentworth

In World War II-era England, it seems a noblewoman may have come back from the dead
Anne Jocelyn and a friend were killed trying to escape the first German assault on France. Before leaving to join the war, it was up to Anne's husband, Phillip, to bury her body for burial. That was three years agoand now Anne has returned to England. Looking and talking exactly like Phillip's wife, the woman insists he mistook her friend's body for her own and buried it by mistake. After three years hiding from the Nazis, Anne has finally escaped and come back to him. Phillip doesn't believe her, but as far as she's concerned Anne Jocelyn's riches are her own. Only the brilliant governess-turned-sleuth Miss Maud Silver will be able to divine the truth . . .