Christopher Banks is the country's most celebrated detective.
But one unsolved crime still haunts him - the disappearance of his parents in Shanghai when he was a small boy.
Christopher is off to Claridges.
Will Sarah be there?
His mother's commitment to abolishing the opium trade is making Christopher's father's life impossible.
Christopher's father has been kidnapped, but Uncle Philip is taking charge.
Sarah's impending departure for Shanghai is pushing Christopher into solving his father's disappearance.
Christopher has gone to Shanghai to solve the mystery of his parents' disappearance, but he is distracted by Sarah's apparent unhappiness.
Christopher agrees to go away with Sarah, but Inspector Kung's news leads him into the war zone.
Christopher rescues his old friend Akira, now a Japanese soldier.
Together they search for the house where Christopher's parents are being held.
The Yellow Snake's identity is finally revealed.
It is 1958, and Christopher's search for his mother is not yet over.