This volume argues that we must examine the boundaries in fiction and non-fiction crime writing with an awareness of and turn toward the unseen structures and spatial uncertainties that so often lead to and reflect collective fears and anxieties. Drawing upon the insights and expertise of an international array of scholars, the chapters within explore the interplay of the literary, historical, social, and cultural in various modes of crime writing from the 1890s to as recent as 2017. They examine unseen structures and uncertain spaces, and simultaneously provide new insights into the works of iconic authors, such as Christie, and iconic fictional figures, like Holmes, as well as underexplored subjects, including Ukrainian detective fiction of the Soviet period and crime writing by a Bengali police detective at the turn of the twentieth century. The breadth of coverage—of both time and place—is an indicator of a text in which seasoned readers, advanced students, and academics will find new perspectives on crime writing employing theories of cultural memory and deep mapping.