Ranger, the time-traveling golden retriever with search-and-rescue training, helps two new friends survive the Great San Francisco Earthquake! Ranger travels to San Francisco and meets Lily Chen. She was sent from China to America to work as a young servant, but she dreams of studying to be a doctor. When the Great Earthquake hits, Ranger arrives in time to rescue Lily from falling beams in the mission house where she lives. Together they flee to safety, stopping to help another girl, May Wong, save her little brother from the family's collapsed market. Lily and May try to make their way through the ruined city with Ranger at their side. But can they escape crumbling buildings and raging fires, all while facing anti-Chinese discrimination?