In the highly anticipated follow-up to Flowers over the Inferno, Superintendent Teresa Battaglia returns for a chillingcold case. After forty years on the Italian police force, the once-brilliant criminal profiler is flagging under the wear ofthe job when a decades-old murder investigation lands on her desk. DNA analysis has revealed that a painting fromthe final days of World War II contains matter from a human heart. Teresa is able to trace the evidence to Val Resia,one of Italy's most isolated, untouched regions.When Teresa's investigation hits too close to the truth, a fresh human heart is hung at the valley's entrance, awarning not to cross its threshold. As she hunts a ruthless killer, Teresa must face down her own rapidly deterioratingphysical and cognitive abilities, as well as someone she hoped never to see again-a man who has just becomeher supervisor.