I thought I didn't like crime fiction until I discovered Sophie Hannah and Helen Fitzgerald.
I'm also working my way through the Poirots, in order. They're all the same, really. Someone contacts Poirot to say "something fishy is going on, please come and investigate" but by the time he gets there, there's been a murder. Then someone contacts him to say "I know something about the murder" but before they can say who it was, they've been murdered too. Then Poirot works it all out.