Wilkie Collins 
The Legacy of Cain 

The Law and the Lady is a detective story, published in 1875 by Wilkie Collins. It is not quite as sensational in style as The Moonstone and The Woman in White. Just a few days after the wedding, various incidents lead Valeria to suspect her husband is hiding a dark secret in his past and she discovers that he has been using a false name. He refuses to discuss it leading them to curtail their honeymoon and return to London where Valeria learns that he was on trial for his first wife's murder by arsenic. He was tried in a Scottish court and the verdict was 'not proven' rather than 'not guilty' implying his guilt but without enough proof for a jury to convict him.