Umiko Wada never set out to be a private detective, let alone become the one-woman operation behind the Kodaka Detective Agency. But so it has turned out, thanks to the death of her former boss, Kazuto Kodaka, in mysterious circumstances. Keen to avoid a similar fate, Wada chooses the cases she takes very carefully. A businessman who wants her to track down his son offers what appears to be a straightforward assignment. But she should have known that the simplest cases are never simple at all. Soon she finds herself pulled into a labyrinthine conspiracy with links to a 27-year-old investigation by her late employer and to the chaos and trauma of the dying days of the Second World War. As Wada uncovers a dizzying web of connections between then and now, it becomes clear that someone has gone to extraordinary lengths to keep the past buried. And the deeper Wada digs, the more danger she finds herself in.