I know your own mood would have been better if this question had been answered sooner.
There are several mood changes in the Richard Connell short story, "The Most Dangerous Game." The story starts with the protagonist, Sanger Rainsford, enjoying a peaceful evening aboard a yacht somewhere in the Caribbean. The atmosphere changes suddenly when Rainsford falls off the yacht and is forced to swim for his life. He arrives on an island and discovers a huge home owned by the eccentric Russian General Zaroff. At first he is treated hospitably, being wined and dined in surroundings fit for a king. But, the next day Rainsford discovers that he, the world renowned hunter, will now be the hunted. The rest of his stay is one of terror and fear. His will is tested as is his physical stamina and mental stability. In the end, he survives, only to return to Zaroff's bedroom to renew the hunt. The story ends with Rainsford once again at peace.
The level of suspense grows along with the rising action, culminating in an unexpected surprise ending.