Ralph woke up on the island and found Piggy. Piggy found a conch shell and knew they should blow it so others would hear it. Well, others did heard it and came towards it.
They build a signal fire so maybe, just maybe, someone will see the smoke and rescue them. Right now, there main ambition is to be rescued.
Sam and Eric think they see the beastie that all the kids are scared of. They tell Ralph and they all try and work together to hunt and kill it. Everyone is starting to lose their sanity now.
The whole crew of boys find and attack the beastie with sticks and rocks, poking, stabbing, and kicking it. They don't know that it is all in their imagination.
After Piggy was pushed off a cliff by Roger and Simon was killed because he was mistaken for the beastie, Jack goes off with his group of boys and start trying to kill Ralph because they all hate each other.
A Naval Officer sees the signal fire's smoke and came to rescue them! They are saved!