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A few days before Christmas, with Parma gripped by frost, Ghitta Tagliavini, the elderly owner of a student guesthouse in the old town centre, is found murdered in her apartment. The case is assigned to Commissario Soneri, but the investigation holds a painful, personal element that sends waves of nostalgia sweeping through him. Tagliavini's guesthouse is where Soneri met his late wife Ada, and where the young couple spent unforgettable hours in each other's company. But the present can embitter even the sweetest memories. An old photograph of Ada with another man sends Soneri into a spiral of despondency, ever more so when he realises her death may be linked to Tagliavini's willingness to let rooms by the hour to the powerful in Parma, and to her lucrative sideline as backstreet abortionist and blackmailer. Though Soneri would like nothing more than to be allowed to drop the case, he doggedly persists, uncovering at last, along with the truth behind Tagliavini's death, rife corruption at Parma's rotten heart and a raft of ghosts from Italy's divisive past.