Valley of Treasure — Susan K. Marlow

The hunt for the lost gold is on! Jem Coulter and his friends celebrate the end of the Civil War in their town with firecrackers, parades, and anticipation for a bear-and-bull fight. But chaos ensues when a bull breaks loose, causing wood splinters and fence posts to rain down and break his cousin Nathan's legs. With the Coulter family unable to afford a San Francisco surgeon, the family and their friend Strike-It-Rich Sam devise a plan to raise money. Jem, his sister Ellie, and Strike embark on a quest to recover lost gold. Will they find their treasure in the valley, or will they have to strike more gold in order to help Nathan?