"The Killer in the Ruins" is a fascinating detective story written by the Austrian writer Oliver Bottero. This book unfolds a complex story about detective Max Brenner, who investigates a series of gruesome murders in an ancient castle in the Subcarpathian region. Unrevealed secrets, suspicions and betrayal are constantly intertwined in this book, forcing the reader to experience at the limit of their abilities. As Detective Brenner unravels the complicated cases and tries to find the killer among the many suspects, the situation becomes more complicated, and each twist of the plot brings a new twist. This book will not leave indifferent any lover of tense detective stories.