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.