Summer 1941: Hitler invades the Soviet Union. Convoys of cargo ships with war materials began the perilous journey to Murmansk, and ordinary sailors face the German superiority in the icy Arctic sea, putting their lives at stake.
Pottan is going to a riding camp, but ends up at a recycling center where she is taken care of by the strange staff. One day Pottan finds out that the staff are building a space rocket.