Rainsford and Whitney were on the yacht. They were talking about the island known as "Ship-Trap Island". Apparently the island is known for having a bad reputation.
Climax
Rainsford heard three gunshots in the distance from the yacht. He got on top of the rail to get a better view and he lost his balance and fell into the sea. He swam to where he heard the gunshots, and then he heard a cry of an animal he did not recognize. He finally made it to the island and pulled himself up.
Falling action
Rainsford found himself at the front of a mansion. He knocked on the door and two men answered, their names were Ivan and general Zaroff. General Zaroff invited Rainsford in and offered him a meal.
Resolution
General Zaroff tells Rainsford that he is an excellent hunter and that he has gotten bored of traditional hunting. He tells Rainsford that he instead hunts other humans. He says Rainsford will be his next target.
Rainsford has made traps for General Zaroff, but he kept on going. Eventually Rainsford made it to the edge of the island, but Zaroff was closing in on him. So at the last minute Rainsford jumped from the island and wet underwater.
The General was tired after a long day and an exceptional dinner, so he went to bed. He noticed that there was something behind the curtain and it ended up being Rainsford. So the General and Rainsford fought, Rainsford ended up being the winner.