He was on a yacht and he was trying to fall asleep and heard 3 gunshots.
He stood up to go and investigate, it was dark so he was leaning out side of the boat so that he can see and he feel in the water.
Rainford found a house and went in it to see if there were people there. When he opened the door there was a general named Zaroff. That told him that he was a hunter and had killed every animal he could have killed so he had a new animal "humans".
The general let rainsford play a game that involved him getting hunted so he diffended himself by making traps and weapons. He showed the general that he has what it takes to win the game.
His traps killed his main man Ivan and the general was still standing, he went hunting for him and Rainsford jumped out of the island into the water and the general could not get him.
The general 3rd day was up to find him because he thought Rainsford died in the jump so he gave up. Rainsford appeared in his house again and won the game.