Rebus by Ian Rankin

In this gripping crime novel, a seasoned detective finds himself embroiled in a complex web of deceit and danger as he navigates the gritty streets of Edinburgh. Tasked with solving a series of brutal murders, he must confront his own demons while unraveling a conspiracy that reaches into the highest echelons of power. As the body count rises, the detective's relentless pursuit of justice leads him to question the very nature of truth and morality, culminating in a thrilling and unexpected climax.