Miss or Mrs.? by COLLINS, Wilkie

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 Natalies fathers estate. When Natalie secretly marries her cousin, Turlington arranges to have Natalies father murdered, to gain control of his fortune. (Summary by Christine Dufour)