42.
You either get it or you don’t. If you don’t, read the only five book trilogy I know of. Its funny, though from a rather British angle.
Admit it, you’re searching for the meaning of the life, the universe and everything. Read to discover answers.
And don’t panic.
David Hershey 
I’ve read one of the books .. and didn’t like it that much .. but sometimes as it happens you are not just in the right frame for a book, and with review i’m going to give it another shot 🙂
Like any book, its not for everyone. I’d say if you like British humor, that’s a big indication if you’d like it.
Oh, i’m not much exposed to british humour … thought i have lived in huntingdon for a few months last yar 😛