Nga-Yee, a librarian, lives a quiet life with her fifteen-year-old sister Siu-Man. After a difficult, impoverished upbringing and the deaths of their parents, they are finally finding a bit of stability. Then one day, Nga-Yee comes home to find her teenage sister has jumped to her death.
Was it suicide, or was she pushed? And does it have anything to do with a recent trip on the Hong Kong subway which left Siu-Man silent and withdrawn? Nga-Yee cannot rest until she knows the truth about her sister - even if that means tracking down her sister's friends one by one and making them confess.
Part detective novel, part revenge thriller, Second Sister explores themes of sexual harassment, internet bullying and teenage suicide - and vividly captures the zeitgeist of Hong Kong today.