I was raised on English mysteries - my grandmother used to read aloud before dinner every evening when I spent summers with her. I have the complete collection of Dorothy Sayers' Lord Peter Wimsey books - I still love to read those. For more current ones, Ruth Rendell and P.D. James are quite good. I also like Elizabeth George.
Children's classics - I own all the E. Nesbit books (such as The Five Children and It), I've read every Arthur Ransome book, I don't know how many times I've read Alice in Wonderland and Through the Looking Glass. I also own the Chronicles of Narnia and have read them many times. Sherlock Holmes is always a good read.
I like Kathy Reichs - her character Temperance Brennan is based so closely on her character as a forensic pathologist, and she brings a lot of realism to her mysteries. I greatly dislike the TV show based on her books (Bones), because the characters don't resemble the book at all, and the setting has been totally changed.
Harry Potter - I've read them all, most of them out loud to my kids. (They like the voices I do for the different characters).
Mark Twain