That Affair at Portstead Manor

That Affair at Portstead Manor, written by Gladys Edson Locke and published in 1914, is a mystery novel set in an English country home during a house party. The story revolves around a double mystery, with one of the three detectives being a woman who uses her common sense and logic to unravel the complexities of the case. The novel is notable for its early inclusion of a female detective character, showcasing the evolving role of women in mystery fiction.