In narrative fiction what is central idea called

The Central Idea is usually called the "Theme"

Explanation:

A central idea and theme both mean the subject of the authors narrative:)

I hope this helped you:)

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tom comes from a southern part of the hemisphere and down in the south they talk with a lot of slang the family doesnt quiet understand what tom is tryna say becaus ehe talks like a three year old but near the end they finally try and desihper toms letter and its a success i have no idea hwta book this is or how to even answere this question honeslty but i am a really fast typer so i did this actually incrediably quick with the swiftness of the flash