Lady Audley's Secret

Popular 1862 mystery novel written by Mary Elizabeth Braddon.

Bitch in Sheep's Clothing: Lady Audley turns out to be one.
Blondes Are Evil
Blue Eyes: Lady Audley.
Brilliant but Lazy: Robert Audley.
Gentleman Detective: Robert Audley again.
Gold Digger: Lady Audley turns out to be one of these as well.
Hair of Gold: Subverted.
Jesus Saves: Robert Audley prays sincerely for the first time in his life when he starts investigating the disappearance of his friend. A connection is made between his taking an interest in spirituality and beginning to overcome his general apathy and laziness.
Kill It With Fire: Lady Audley attempts to murder her nephew by setting his inn room on fire and locking him inside.
Kissing Cousins: Alicia has feelings for her cousin Robert. He dosen't feel the same.
The Ladette: Alicia.
Mary Sue Classic / Purity Sue: Subverted.
May-December Romance: Sir Michael is considerably older than Lady Lucy.
The Ophelia: Lady Audley's mother is stated to have been one. Lady Audley herself is a perfectly sane woman imprisoned in an asylum because it is more convenient for the family to get rid of her in this way than to have to deal with a trial.
Parental Marriage Veto: George Talboy's father is not pleased about his son's choice in marriage.
Rich Idiot With No Day Job: Robert is actually a barrister but fits this as we never actually see him doing any work. He mostly just sits around.
Secret-Chaser: Robert Audley.
Spirited Young Lady: Alicia Audley.
Tomboy and Girly Girl: Alicia Audley and her stepmother Lady Audley, respectively.