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Marie-Grace cant wait to begin her journey up the Mississippi River with her father. The steamboat theyre traveling on is the biggest and fanciest boat Marie-Grace has ever seen. Its crowded with all sorts of interesting passengers, including Wilhelmina Newman, a girl her age. Wilhelmina is traveling alone, and shes carrying a secret in one of her trunks-clues to hidden Gold Rush treasure. Marie-Grace and Wilhelmina have to unravel the clues to find the gold-and theyre not the only ones looking for it! An illustrated Looking Back essay describes steamboat travel in the 1850s.