This is a historical novel, based on a true story that happened during the First World War, on the Eastern Front, in the winter of 1916-17 and which was disclosed and followed by newspapers such as the New York Times. A pack of wolves made up of hundreds of specimens, due to the destruction of the conflict, began to attack and devour not only civilians but also Russian, German and Austro-Hungarian soldiers isolated or in small groups, penetrating even the trenches at night. The belligerent armies were forced to enter into a local truce and form mixed patrols to track down and exterminate the pack. They succeeded but only after several months. A true but little-known story on which this exceptionally thorough and detailed historical novel, unique internationally, was based.