Peter James’s Host was an early electronic book.
From Penguin’s 1994 Announcement:
Penguin (UK), publisher, will launch its first electronic novel in November 1994. The novel is Host by Peter James and will cost GBP12.99 on floppy disk. The disk includes the novel, research material used by the author, an audio clip of the writer explaining the background to the novel and a video introduction. (Source)
Naturally, people were outraged:
When Peter James published his novel Host on two floppy disks in 1993, he was ill-prepared for the “venomous backlash” that would follow. Journalists and fellow writers berated and condemned him; one reporter even dragged a PC and a generator out to the beach to demonstrate the ridiculousness of this new form of reading. “I was front-page news of many newspapers around the world, accused of killing the novel,” James told pop.edit.lit. “[But] I pointed out that the novel was already dying at an alarming rate without my assistance.” (Link)