Miss or Mrs.? by Wilkie Collins (1824 - 1889)

Natalie Graybrooke is in love with her cousin Launcelot Linzie, but engaged to Mr. Turlington, an older man who covets her fortune and whom she detests. Turlington is the executor of Natalie's father's estate. When Natalie secretly marries her cousin, Turlington arranges to have Natalie's father murdered, to gain control of his fortune. (Summary by Christine Dufour)