As mysterious as a dark moorland: the crime novel by literary critic Margarete von Schwarzkopf. Art historian Anna Bentorp has rented a picturesque cottage in the seclusion of a Lower Saxony moor to study old maps of the region undisturbed. However, tranquility eludes her: strange deaths and events begin to accumulate, all seemingly connected to a lost treasure. Anna digs deeper into her research on the enigmatic maps until she is caught up in the events of the past and finds herself in danger.