In November, at the very beginning of the terrible winter of 1941, when the blockade ring closes around Leningrad, a group of young iceboat athletes goes out onto the thin, not yet formed ice. The mission to deliver ammunition turns into an operation to save orphans from an orphanage who were not evacuated in time. Former rivals in regatta sports must now turn into a real united team in order to survive themselves and give hope to everyone else.