“Big Horizon” is an adventure story by Lev Linkov, published in 1961. The plot is dedicated to the combat everyday life of the maritime border guards of the Kuril Islands. The plot is based on actual events. Severe service at the border, a friendly team of sailors, and glorious military traditions help the hero of the story, Alexei Kiryanov, to grow into an excellent border guard and open up great horizons for him in life. At the center of the story is the fate of Alexey Kiryanov, who was called up for naval military service. The brave sailor had to keep watch at the foot of an active volcano, save people from a devastating tsunami, sail on a small boat through deadly whirlpools, and engage in battle with a gang of brutal spies.