Obsessed with martial arts and ghost stories, Ruby is part of a gang of Chinese and ex-pat children who hide out in ruined White Cloud Temple. But the world of Shanghai in the late 1920s is driven with danger: disease, crime, espionage and revolution are sweeping the streets. And since the death of her younger brother Thomas, Ruby is stalked by another anxiety and fear. Faced with a series of local hauntings, and armed with a lucky bookshop find - The Almanac of Distant Realms - Ruby forms the Shanghai Ghost Club to hunt down restless spirits. When best friend Faye is kidnapped by the Green Hand, Ruby must trust a mysterious stranger - and face her worst fears - in order to save her friends, and her own life. And in the ensuing fight she will catch a glimpse of the one spirit she has longed to see ...The secrets that Ruby's father and friends have kept from her are coming back to haunt them all

Ruby - a Western girl who feels more Chinese than English - and her friend Charlie must follow the Yangtze hundreds of miles upriver, travelling by Chinese junk and rogue steamer, through bandit and ghost haunted countryside - doggedly tracking Moonface as he spirits Charlie's sister Fei off to his home village. Everything is in flux around them: civil war pulsing, with Nationalists, Communists and warlord bandits struggling for control. The river rises and falls, villages spring up and are gone again. Ruby and Charlie brave a shipwreck and a gunbattle and then take a perilous cliff path to Moonface's lair.