``The Truth Behind the Will'' is a mystery novel that depicts a family's conflict over a wealthy grandfather's disturbing will. The main character, Hideki Aizawa, tries to decipher the cipher-like message left behind by his grandfather, but secret conflicts between his family members and hidden secrets from the past gradually come to light. This story depicts the eerie truth that lies behind superficial family ties and the courage to face it. Hideki and his family face a terrible truth and are forced to forge new bonds. The dark history of the family hidden by the will and the story of rebirth unfold.