Darcy's Alibi: A Sweet "Pride & Prejudice" Variation

A murder in Meryton leads to Lizzy becoming Darcy's Alibi.
When Wickham is discovered with a knife through his heart—and the hilt has the Darcy crest—suspicion immediately turns to Mr. Darcy. Lizzy soon learns who the real killer was, and the circumstances of why, and she is forced to act to save the culprit and Mr. Darcy. She claims she spent the night with him at Netherfield, thus besmirching her reputation and ensuring utter ruin unless Darcy offers marriage. He does, but he believes she is the murderer, and he holds her at arms' length, clearly not trusting her. Lizzy is miserable in their marriage, but telling the truth betrays the trust of another. How can she get Fitzwilliam to see past his assumptions and allow them to have a genuine marriage built on love and respect?
While Abbey sometimes writes steamy JAFF, this is strictly SWEET. There is one fade-to-black scene between the married couple.