In 1804, Meriwether Lewis and William Clark set forth to explore and map the West, and forge a trade route to the Pacific coast. Though their adventures and contributions to American history are well known, a vital member of their team was nearly forgotten by time. Amid the soldiers, cartographers, and boatmen, one particular explorer in The Corps of Discovery stands out: Seaman, Captain Lewis’s giant black Newfoundland dog. Seaman is more than a just a companion. He is a skilled hunter, a talented scout, and a fierce guardian, frequently risking his own life to save that of his master’s. Along with Seaman, Sacajawea, and the intrepid pioneers in their party, Lewis and Clark face countless dangers—starvation, deadly storms, and hostile tribes—as they attempt to achieve President Jefferson’s ambitious assignment.