Dracula by Bram Stoker.
Dracula is an 1897 Gothic horror novel by Irish author Bram Stoker. Famous for introducing the character of the vampire Count Dracula, the novel tells the story of Dracula's attempt to relocate from Transylvania to England, and the battle between Dracula and a small group of men and women led by Professor Abraham Van Helsing.
The e-Book is free but contains advertisement. For a small payment the advertisement can be easily turned off.