The Castle of Otranto is a 1764 novel by Horace Walpole, generally regarded as the first gothic novel.

From the front flap:
This series of texts by well-known authors has been prepared according to present-day didactic and linguistic needs. The notes are parallel to the text, a device which is now beginning to replace the use of footnotes. By always looking along the same line that you are reading, you will not risk distraction; you will also have the
chance to use a great number of words and expressions which have been analysed in relation to your personal knowledge of the language, helping you to face new reading passages alone.
The notes, which are strictly in English, have been prepared by teachers familiar with the various linguistic features involved and with modern developments in language teaching. Since each book
consists of one short novel or a collection of short stories, you will be able to read complete plots without losing interest, and enjoy reading several different authors, each with his own particular
literary style.
At the end of each, there are comprehension exercises designed to test and consolidate understandins of the text.