* Thomas Rafferty - A young lawyer who is new to the firm of Banister & Bellin and becomes involved in the mysterious case of the crooked banister.
* Sarah Banister - The daughter of the senior partner of Banister & Bellin, who is also romantically involved with Rafferty.
* John Bellin - The senior partner of Banister & Bellin and a mysterious and enigmatic figure.
* Annabel Lee - A beautiful and enigmatic woman who is connected to the case of the crooked banister.
* The Crooked Man - A mysterious figure who is seen lurking around the Banister & Bellin law firm and seems to be connected to the case of the crooked banister.
Supporting Characters
* Mrs. Banister - Sarah's mother and the wife of John Bellin.
* Mr. Banister - Sarah's father and the senior partner of Banister & Bellin.
* Miss Bellin - John Bellin's sister and a partner in the firm of Banister & Bellin.
* The Office Boy - A young boy who works at Banister & Bellin and is the first to discover the crooked banister.