"Corps of Discovery" tells the background story of the Lewis and Clark Expedition, with a focus on the members who formed "The Corps" and their contributions to the Mission. Book One gives a historical context to the Expedition, including the initial planning and early execution of the Plan. Book Two is a retracing of the actual Expedition with annotation of the journal entries by the Explorers and the Author's modern-day Experiences in their footsteps on The Trail.