1899, Glasgow. A man is stabbed to death in a tenement courtyard, and Juan Camarón, photographer-cum-sleuth, is enlisted to assist the police investigation. Perhaps his innovative photographic method can bring to light what the eye may have overlooked.

Yet Juan has problems of his own. His late father's legacy, a monumental photographic record of the architecture of colonial Cuba, is threatened by a charge of plagiarism from a mysterious señora. Meanwhile, Juan's hoped-for happiness with his fiancée, Jane, might be over before it's even begun, and even more so when a visiting professor is murdered and Jane is witnessed fleeing the scene. Juan is torn between finding the killer and finding Jane, but are they one and the same? The truth may be hidden in the photographs.