The local police prove unhelpful when a 500-pound dinosaur skull vanishes from a secret excavation on Sage's family's ranch, so Teddy and his friends conduct their own investigation.
Nineteen-year-old Sarah masquerades as a man during the Civil War, serving as a nurse on the battlefield and a spy for the Union Army, escaping from the Confederates, and falling in love with one of her fellow soldiers. Based on the life of Sarah Emma Edmonds.