"Christopher Quarles: College Professor and Master Detective" by Percy James Brebner is a detective novel written in the early 20th century. The story revolves around the titular character, Professor Christopher Quarles, who, despite being a professor of philosophy, is also an adept detective. The narrative focuses on his involvement in solving intricate cases, starting with the mysterious death of a man named Mr. Ratcliffe, showcasing Quarles’s unique methods and his relationship with the young detective, Wigan. At the start of the novel, we are introduced to Wigan, who arrives at Blenheim Square to investigate the death of Mr. Ratcliffe, found dead in his study under suspicious circumstances. The narrative describes the peculiar details surrounding Ratcliffe's death: a sapphire stone positioned on his desk and a set of ivory boxes. Quarles enters the scene through his chance encounter with Wigan, and despite their initial differences, he expresses a keen interest in unraveling the mystery. The chapter vividly portrays Quarles's analytical thinking, as he begins to piece together clues and formulate theories about the circumstances leading to Ratcliffe's demise, setting the stage for a captivating blend of intellectual exploration and thrilling detective work. (This is an automatically generated summary.)