In 19th-century San Francisco's Chinatown, American adventurer Gilbert De Quincey saves slave girls owned by the Chinese Tong factions.In 19th-century San Francisco's Chinatown, American adventurer Gilbert De Quincey saves slave girls owned by the Chinese Tong factions.In 19th-century San Francisco's Chinatown, American adventurer Gilbert De Quincey saves slave girls owned by the Chinese Tong factions.