E. Phillips Oppenheim 
The Peer and the Woman [EPUB ebook] 

Lord Alceston, the Earl of Harrowdean, statesman, philanthropist, nobleman, is murdered in his own study on the night of a great ball given at his home. On the same night a mysterious woman is murdered in the slums of East London. The valet disappears. Thus begins a moody and dramatic tale of love, jealousy, and revenge.