During the final months of the World War II, a group of special forces sailors, under the command of Lieutenant Balandin, receives a secret order of special importance to destroy enemy tankers, seaplanes and gun installations to ensure the free landing of their troops.

The heroine of this story is a simple girl from Odesa named Tonya Chumakova who dreams of the sea. And so she is hired as a radio operator on one of the ships of the Black Sea whaling fleet...