Flavia de Luce is eleven years old, has a brilliant mind, a sharp tongue and... a nose for trouble. He lives in a rundown English estate with his eccentric father and two older sisters with whom he doesn't always get along. When one day she finds a body on the family estate and her father becomes the main suspect, Flavia without hesitation decides to take matters into her own hands - and follows the trail of secrets, lies and family secrets.