I detest Enid Blyton and like Agatha Christie. What should I read next?

I like detective and mystery stories and detest Enid Blyton. I like Agatha Christie. What should I read next? Pollster Sherlock Holmes, the great detective created by Sir Arthur Conan Doyle, appears in many stories including, perhaps most famously, The Hound of the Baskervilles: the story would be a worthy successor to Agatha Christie. For a more contemporary sleuth, the eponymous heroine of Harriet the Spy by Louise Fitzhugh is well worth following.