England, 1930s. Christopher Banks has become the country's most celebrated detective, his cases the talk of London society. Yet one unsolved crime has always haunted him; the mysterious disappearance of his parents, in Old Shanghai, when he was a small boy.

They expect to face many hazards - some strange and other-worldly - but they cannot yet foresee how their journey will reveal to them dark and forgotten corners of their love for one another. 'A beautiful fable with a hard message at its core .