She says South Korea is insisting his case be handled according to previous North-South agreements not North Korean law Yu's case is drawing inevitable comparisons to North Korea's detention of two American female journalists who were captured in March.

VOA: standard.2009.06.05

More significantly, Ms Yu says she has long believed that Amazon itself will one day enter the Chinese market.

ECONOMIST: Selling books in China

Basco-Yu was originally told she would need to have her heart valve replaced after six years.

MSN: Heart disease can be serious, silent in young women

Moranz was 8 when she left Shanghai in 1949, decades before Yu was born.

CNN: The Ghosts of Shanghai