Collins, Wilkie - The Moonstone

Well a lot of other books got in the way, and it was a bit of a long haul (It's a decent length really) but this is a fantastic mystery and a bit of a classic. Intriguing, funny with very well developed characters (unlike lots of modern detective stories) and told from several perspectives.

quoted by T.S. Eliot as, "The first and greatest English detective novel."

Good fun!