Young private detective Марлен Исаев lived a rather dull life—until one day an old front-line veteran came to him with a request to find the missing great-grandson, Миша Краюхин. Very soon Исаев realized he had brushed against a thrilling and terrifying secret: he found a mass grave where “Красноармієць Михаил Краюхин” was buried—his contemporary, who had died… in 1944. The investigation led Марлен and his friend Виктор to a portal leading to the 41st year… What should they do? Go “to war,” save Private Краюхин, and bring him back to the quiet and safe future? Or stay on the front line to help thousands of ordinary soldiers like him survive to Victory?