The secret police agent finds that factory director wife is counterrevolutionary but dies from the heart attack. The director reads the diary of an agent and turns his wife to police.

1941 year. The flagship of the head detachment of the Black Sea Fleet gives an order to one of the submarines to remove the crew from the damaged torpedo boat. An enemy cruiser discovers a Soviet submarine and bombards it with bombs. Submarine forced to lie down. But the task will be completed - and the enemy will take flight.