The September Society by Charles Finch

Set in Victorian England, this mystery novel follows gentleman detective Charles Lenox as he is drawn into a perplexing case involving the disappearance of a young Oxford student. The investigation takes a dark turn when a cryptic note and a dead cat are discovered, leading Lenox to uncover a secretive group known as the September Society. As he delves deeper, Lenox must navigate a web of academic intrigue, hidden motives, and dangerous secrets, all while racing against time to prevent further tragedy.