One Thursday lunchtime the Earth gets unexpectedly demolished to make way for a new hyperspace bypass. For Arthur Dent, who has only just had his house demolished that morning, this seems already to be more than he can cope with. Sadly, however, the weekend has only just begun, and the galaxy is a very strange and startling place.

 
I've known the Hitchhiker's novels since I was a baby, and I couldn't be more familiar with them but I've only ever read the first (HHGTTG) and the last of the books (Mostly Harmless). It's about bloody time I rectified that! and so I bought the five books in a box set so I can read the whole lot, and no longer feel deprived.