In the spring of 1805, Lewis and Clark resumed their journey up the Missouri River in search of the Pacific. But to reach the ocean, they would have to cross the towering Rocky Mountains. It was a forbidding task, and one they couldn’t achieve alone. They would need the help of their young interpreter, Sacagawea, and her tribe, the Shoshone. But first, they had to locate the elusive Shoshone – and with winter fast approaching, time was running out.

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