On the eve of the New Year, a Belgian plane carrying a group of Antarctic researchers crashes in the area of the Pearl Mountains. Only the Soviet expedition responds to their call for help. For several days, Soviet pilots, despite the weather conditions and risking their own lives, set out in search of the Belgians...

Kindergarten teacher Evgeniy Ivanovich Troshkin is reluctantly sent undercover to take the place of an imprisoned thief who stole Alexander the Great's helmet. Evgeniy uses his striking resemblance to the thief to infiltrate his gang and learn the location of the stolen artifact. He finds the gangsters are unexpectedly similar to his students- they also need love and care.