The crooks in London know how it works. No one carries guns and no one resists the police. Then a new gang appears that go one better. They dress as police and steal from the crooks. This upset's the natural order of the police/criminal relationship and the police and the crooks join forces to catch the IPOs (Impersonating Police Officers), including an armored car robbery in which the police must help the gangs to set a trap.
俄国战争期间，一支红军游击队遭到德国军队伏击，被困山林。游击队员索特尼科夫（Boris Plotnikov 饰）和雷巴克（Vladimir Gostyukhin 饰）奉命离开部队，寻找补给。两人穿过茫茫雪原，在某个信奉基督的村长（Sergei Yakovlev 饰）家中寻得一头羊。返回途中却因迷路与一小股德国士兵遭遇，枪战中索特尼科夫负伤，两人奋力逃脱，躲进一户人家。不久后三个白匪不期而至，并发现他们的行踪。 成为俘虏的索特尼科夫和雷巴克被带入德国军营，共同面临着人生最大的考验…… 本片根据贝科夫的中篇小说《索特尼科夫》改编。
