What is the setting of Peril at End House, by Agatha Christie by Agatha Christie?

The setting of Peril at End House is a summer vacation town on the coast of England called St. Loo. End House itself is a dilapidated old mansion, falling apart, set atop a cliff on the English coast. The house is essential to the plot because it is essentially Nick's motivation. Nick has an unreasonable love for her house and she is willing to murder to have the money to upkeep it and to continue to live there.