Mark Twain's 1851 story about two runaway friends, a fostered white boy and an escaped black slave, who sailed on a raft down the Mississippi River in search of freedom and adventure.Mark Twain's 1851 story about two runaway friends, a fostered white boy and an escaped black slave, who sailed on a raft down the Mississippi River in search of freedom and adventure.Mark Twain's 1851 story about two runaway friends, a fostered white boy and an escaped black slave, who sailed on a raft down the Mississippi River in search of freedom and adventure.