An English family consisting of: a man, a women, and a boy (Teddy), found a mongoose named Rikki Tikki Tavi, nearly dead on a garden path. They brought him home, revived him and kept him as their pet.
The next day, Rikki Tikki Tavi went outside, to find a garden, he pictured as a perfect hunting ground. He meet a tailorbird, named Darzee, and his wife, who mentioned a predator called Nag... Behind him popped a cobra from the bushes, who identified himself as, Nag.
Rikki Tikki and Nag were having a chat when Darzee warned him, Nagaina, Nag's wife, was attacking him from behind. Rikki Tikki Tavi fought her off and her and Nag fled to the bushes. In the bushes, another snake appeared and attempted to kill Rikki Tikki Tavi.
Rikki Tikki Tavi fought off the snake, called Karait, and delivered one bite that caused immediate death. The family heard commotion, came outside and the man beat the snake with a stick and disposed of it.
That night, Rikki Tikki Tavi went exploring outside. He met Darzee and his wife, and through song they informed him, Nag and Nagaina were in the bathroom, attempiting to kill the family.
Rikki Tikki Tavi hurried to the bathroom and found only Nag. It was a hard fought battle until the man heard them and shot Nag with his shotgun to end the fight.