I Didn't Kill You, Duke!

The only thing that explains me is that I thought I’d gone mad. That’s why I agreed to the pleas of a stranger who had my face. Now I’m in a different world, under someone else’s name, replacing the one who killed my fiancé—the duke. Only by chance he survived. Ahead of me, most likely, is execution, but for some reason the duke is dragging his feet and not rushing to hand me over to justice. What is he planning, and why does he look—like two drops of water—like my husband, the one who betrayed me and practically destroyed me?