The first intimation of danger on the island occurs before Rainsford even swims to shore. He hears the cry of an animal being hunted; it is a piercing sound of an animal with which Rainsford is not familiar.
When Rainsford gets to shore and begins to explore the island, he finds empty gun shells. He assumes the gun was used to hunt the animal whose cry he did not recognize. Rainsford is puzzled as to why a hunter would use a small gun to hunt a large animal.
There is only a single house on the island, a looming, foreboding structure. General Zaroff's assistant, Ivan, is a huge person who is mute.
All of these details add up to masterful foreshadowing of the horror that Rainsford is to face. He discovers the horror while dining with General Zaroff and listening to the general describe his hunting habits and his prey.
Richad Edward Connell's short story “The Most Dangerous Game” foreshadows danger from the moment one reads the title. What is the most dangerous game? Can someone lose their life playing "the most dangerous game"?
Foreshadowing is continued with the island being described as "Ship-Trap Island" and General Zaroff mentioning to Rainsford during dinner that Zaroff has a "new game." It is easy to think ahead that Rainsford will be in some kind of danger, and may have to play "the most dangerous game," and if he wins, he gets his life; loses, his life is ended.
The last line of the story:"He had never slept in a better bed, Rainsford decided," lets the reader know that Rainsford has killed General Zaroff, and has won "the most dangerous game."