Tom Sawyer is a mischievous young boy with an undying hunger for adventure, and a knack for getting into trouble. He lives with his Aunt Polly in the Mississippi River town of St Petersburg, Missouri. He plays hooky from school; hangs around with Huck Finn, the unsophisticated son of the village drunkard; and deceives his friends into trading their treasures with him.

Tom falls in love with Becky Thatcher, a new arrival in town, who returns his affection initially, and even agrees to an 'engagement'. However, after a slip of the tongue from Tom, she walks off in a huff.

From innocent and imaginary adventures, Tom's life suddenly takes a new turn. One night, while Tom and Huck Finn are in a graveyard, they witness an incident they should not have. Terrified, they flee from the spot, and swear a blood oath that they will never reveal their secret to anyone.

Tom and Huck then find themselves entangled in a series of real and exciting adventures, with dangerous men constantly at their heels.

Can the boys stand up to the occasion, and become real-life heroes? Will they ever be able to reclaim their normal, carefree lives again?