Six years ago, the renowned tango dancer Harry Koivikko was discovered dead in a seedy motel, a knife lodged in his back. Despite launching the largest manhunt the county had ever seen, authorities came up empty-handed. Now, Jussi Vares receives a call from a struggling journalist who claims to know the identity of the killer. However, before Vares can act on this lead, the journalist vanishes without a trace, presenting Vares with the most daunting case of his career. To complicate matters further, Veikko Hopea, an old acquaintance, is granted his first temporary release from prison.