Alice, bored on a riverbank beside her reading sister, sees a White Rabbit pull a watch from its waistcoat and mutter that it will be late. Burning with curiosity, she chases it down a rabbit-hole and falls slowly through a long well lined with cupboards and shelves, talking to herself the whole way down, until she lands unhurt in a hall of locked doors with a tiny garden glimpsed through one of them.
Drinks and cakes make her shoot up and shrink down past any reliable height. Stretched to nine feet she weeps a pool of tears, then, shrunk small again, nearly drowns in it. The constant changing unsettles more than her size: she tries to recite her lessons and gets them wrong, wonders whether she has been swapped for another child overnight, and finds she can no longer be sure who in the world she is.
She meets a parade of creatures who each reason in their own unanswerable way. A hookah-smoking Caterpillar interrogates her identity and gives mushroom that controls her size. A grinning Cheshire Cat tells her that everyone there is mad and that the road taken does not matter if you do not care where you are going, then fades until only its grin is left. At the Hatter's tea-party, time itself has stopped and the talk is all riddles with no answers and pedantic word-games.
Alice reaches the Queen of Hearts, who rules a croquet-ground of living cards by screaming for beheadings at the smallest offence. The threats are loud but oddly toothless, and Alice begins to answer back. The world's pretend-seriousness comes to a head in a courtroom, where the Knave is tried for stealing tarts on no evidence, the King invents rules from his notebook, and the proceedings make a mockery of justice.
Called as a witness and suddenly grown huge again, Alice refuses to be cowed. When the Queen demands sentence first and verdict afterwards, she declares it stuff and nonsense, and when the cards fly at her she cries that they are nothing but a pack of cards. At that she wakes with her head in her sister's lap: the whole of Wonderland has been a dream, and she runs off to her tea while her sister sits on, half-dreaming the wonder of it.