Osaka, 1943: as the Second World War rages and American bombers rain death down upon the city, the once prosperous Omari family is already in decline, financially ruined by the terrible conflict. Then the household is struck by a series of gruesome murders.

Can anyone solve the mystery of these baffling slayings before the Omari line is extinguished entirely? To do so, and unravel the killer's fiendish plot, they will have to delve into the family's past, where a dark and deadly secret has been festering for decades...