"Agents of Light and Darkness" by Simon R. Green is a thrilling urban fantasy that revolves around the characters of the Nightside, a hidden part of London where magic and mystery abound. The story follows private investigator John Taylor, who possesses the unique ability to locate anything that is lost, as he navigates a world filled with supernatural entities and dangerous situations. The narrative kicks off with Taylor being tasked to find a formidable weapon that has the potential to disrupt the balance between light and darkness. As he embarks on this quest, he encounters various allies and adversaries, each with their own agendas. The interplay of humor and dark themes creates a captivating atmosphere that keeps readers engaged.