"The east wind is coming, and it will take you away!" This book is the first part of the series, telling the story of the first friend Rachel encounters who can have a close bond with her. A complex and vicious serial murder case, four victims with no injuries on their bodies but extremely hideous faces and twisted bodies. These became Rachel's first problems as a detective. Four people with different identities, the only common hobby is gambling in underground casinos. Just as Rachel's best friend and secretary Diana is about to become the fifth victim, Rachel arrives and discovers the murderer and his shrewd modus operandi. It turns out that behind these murders there is the support of a person codenamed "W".