This bookseries is very special in a way, because the real plot always gets covered up and forgotten due to other things happening in the story. It is filled with strange actions and witty comments, and I must confess; it made me laugh plenty of times.
In the series «The Hitch Hiker's Guide to the Galaxy», written by the English author Douglas Adams, you meet with Arthur Dent; the relatively normal British man who just happens to find out that his friend Ford Prefect is from the planet of Betelgeuse. As the Earth gets destroyed by the Vogons, some horrifying aliens that never think of others but themselves, Ford and Arthur hitchhike their way to a random place in the universe. After a while they meet Trillian, who Arthur had a little thing for when they both lived on Earth, and Zaphod, Trillian's new boyfriend, a so-called 'douchebag' who just happens to be the President of the Galaxy.
I would say that the main plot of this bookseries is finding the question of Life, the Universe and Everything. Some millions of years ago, philosophers and scientists were so interested in finding the meaning of Life, the Universe and Everything. Therefore they made this computer, called Deep Thought, which was supposed to calculate the answer. 7.5 million years of calculating, it came to the answer «42». The people could not understand what the computer meant, but then it said that if they wanted to know what the question of Everything was, they had to make another computer which was built to find out what the question was.