What is the author's style in Peril at End House, by Agatha Christie by Agatha Christie?

The names in the novel are significant. Nick's name refers to the devil, and also ties her to her evil old grandfather, Old Nick. She has inherited some of her evil nature from the grandfather who raised her. The name of the house, End House, is also significant. The house is the end-all of Nick's life, and it is also the place where Maggie's life will end. The house is also the place where Nick's plotting and manipulation will finally end, the culminations of all her plans.