This is volume 1 of 3.
Originally published as a penny dreadful from 1845 until 1847, when it first appeared in book form, Varney the Vampyre is a forerunner to vampire stories such as Dracula, which it heavily influenced.
Flora Bannersworth is attacked in her own room in the middle of the night, and although her attacker is seemingly shot dead, the body is nowhere to be found. The discovery of two small bite marks on Flora's neck leads Mr Marchdale, an old friend of the family, to the conclusion that she was bitten by a vampire. While Flora recovers, her brother Henry and Mr Marchdale begin their hunt for the vampire. Their suspicions soon fall on the mysterious Sir Francis Varney, who has just bought an old abbey near Bannersworth Hall, and who bears an uncanny resemblance to Marmaduke Bannersworth, a long-dead ancestor of the family. (Summary by Annika Feilbach)
Note that the original text does not have chapters labeled 41-43. The chapters have been renumbered to be consecutive in this project.