A single Ukrainian infantry company find themselves in a life or death battle to defend the eastern front against intense Russian attacks. This is an extraordinary portrait of lives compromised by the turmoil of a bloody war, filmed by Ukrainian soldiers. With exclusive access to a tightly controlled front line, the film follows the mission of a special battalion as they undertake a single deployment on one of Ukraine's most violent battlefronts, a snow-covered forest near Kupyansk. Their mission is to defend a railway line, a key strategic asset that, if captured, will enable Russia to mount a direct attack on Ukraine's second largest city, Kharkiv.