Traditional Chinese edition of Naoki Prize winner Michio Shusuke's Karasu no oyayubi (By rules of crow's thumb). The mystery is the 2009 winner of the Mystery Writers of Japan Award. It is also named top 10 best mysteries in 2009. Two tough middle aged men believe being a swindler is an occupation. One day a girl is placed in their care unexpectedly. They are clueless as to what they should do but they knew they had to start a new life. So they decide...