The Perishing of the Pendragons

The Perishing of the Pendragons" by G.K. Chesterton is a Father Brown story where Father Brown is invited on a boat trip around the Cornish coast, where he encounters a family called the Pendragons, who are plagued by a mysterious curse tied to a local legend about a Spanish prisoner and a treacherous coastline; Father Brown must unravel the complex web of family secrets and a planned crime to prevent the curse from seemingly coming true, using his keen observation skills and understanding of human nature to identify the culprit.