Ernest Hemingway is known for his straightforward and succinct writing style. I´d suggest you try George Orwell - he´s a writer that has a similar plain style of writing without too much flowery prose.

Try anything by Agatha Christie. Theres this mega gripping novel called 'Then There were None'. You will love her. http://esl-bits.net/ESL.English.Learning.Audiobooks/And.Then.There.Were.None/preview.html Here you can find the whole novel from start to finish as written by The Author (not an adaptation). I hope it helps.