Huck and Jim travel down the Mississippi from St. Petersburg to Cairo. Jim is a runaway slave so they have to be careful. They have a lot of adventures on the river. They even meet a king! But is he real? Huck soon finds out the . Huck and Jim travel down the Mississippi from St. Petersburg to Cairo. Jim is a runaway slave so they have to be careful. They have a lot of adventures on the river. They even meet a king! But is he real? Huck soon finds out the .