Hichhikers guide to the galaxy is kind of comical science fiction series written by Douglas Adams, I am not very much into the science fiction but if you are not into science fiction you should not let it hold you back since this is something very different. The book starts out as Arthur Dent finds out that his house is on a way of highway and must be demolished, soon however he finds out that his friend is in fact an alien and that they must leave earth and so begins the travel trought the galaxy. The series contains of five books which you should be able to buy all together with a fairly low price.
The book is rather clever on the jokes and the characters remain entertaining even on the last book of the series. I recommend you to buy this book even if you are not into science fiction or comedy since i suppose it is not very pricey for a six books which are this good.