The story of the book takes place in an alternate universe where the First World War never occurred and Poland is still under Russian rule. Following the Tunguska event, the Ice, a mysterious form of matter, has covered parts of Siberia in Russia and started expanding outwards, reaching Warsaw. The appearance of Ice results in extreme decrease of temperature, putting the whole continent under constant winter, and is accompanied by "Lute", angels of Frost, a strange form of being which seems to be a native inhabitant of Ice. Under the influence of the Ice, iron turns into "zimnazo" (cold iron), a material with extraordinary physical properties, which results in the creation of a new branch of industry, zimnazo mining and processing, giving birth to large fortunes and new industrial empires. Moreover, the Ice freezes History and Philosophy, preserving the old political regime, affecting human psychology and changing the laws of logic from many-valued logic of "Summer" to two-valued logic of "Winter" with no intermediate steps between True and False.