It's the story of an ordinary boy named Charlie Bucket. He was no stronger or faster than anyone else, his family was not rich, powerful or well connected but he was the luckiest boy in the entire world, he just didn't know it yet.
15 years ago, Willy Wonka opened the largest chocolate factory in the world but spies stole his recipes so he closed the factory. It didn't close forever though, and suddenly he decided to allow 5 children to visit the factory and one of them will win a special prize at the end. The children have to find one of the five golden tickets hidden beneath the ordinary wrapping paper of five ordinary Wonka bars. So, Augustus Gloop (a German chocoholic), Verruca Salt (a spoilt English brat), Violet Beauregarde (junior bubblegum champion), Mike Teavee (who hates chocolate) and Charlie Bucket (the luckiest boy in the entire world) win tickets and visit the factory.
"Accidents" happen while on the guided tour. The greedy Augustus falls in the chocolate lake and gets accidentally sucked up and taken away to the room where they make the most delicious kind of strawberry flavoured chocolate coated fudge. Violet, ignoring Wonka's advice, tries some of his three course dinner gum and swells up like a blueberry. Verruca tries to grab a squirrel and ends up falling down the garbage chute in the direction of the incinerator (which thankfully is broken so there's about three weeks worth of rotten garbage to break her fall). Mike tries to use Wonka's chocolate teleport machine and ends up shrunk to about 6 inches high.
Charlie wins the prize - it's Willy Wonka's factory (during his semi-annual haircut he found a grey hair and realised he'd have to find an heir). The only catch? Charlie would have to move the factory and never see his family again. He declines Wonka's offer. However, after Wonka is encouraged to make contact with his estranged father, he realises how important family can be, so he invites Charlie's entire family to move into the factory together.