Kostya, an ambulance driver, is used to living one day at a time. Mired in debts and credits, he thought of nothing better than to get on the first bus and get away from Moscow and his problems. So he finds himself in a southern village, where he is mistaken for the long-awaited doctor Christopher Sergeevich. The locals meet Kostya with all cordiality and even provide him with housing. It seems that the guy had an ideal chance to quickly solve the issue of money and return to Moscow. But pretending to be an experienced herbalist, understanding nothing about medicine, is not an easy task, so Kostya will have to get out of it somehow.