Poirot Investigates is a short story collection written by English author Agatha Christie and first published 1924. In the eleven stories, her famously clever detective Hercule Poirot solves a variety of mysteries involving spies, thieves, kidnappers, and murderers. About Grace's Giant Print Books Our books are especially designed for low vision readers who may not be able to operate an e-reading device, or just love the feeling of a book in their hands. The 30 point font (featured on each back cover) is easy to read, and the books are larger than the industry standard, making them more manageable for arthritic hands and fingers.