In the convoluted realm of cold cases, 'Troubled Blood' by Robert Galbraith weaves a tale that begins in Cornwall, where Private Detective Cormoran Strike glimpses the shadowed past through a new client's plea: her mother, Margot Bamborough, vanished without a trace in 1974. Unaccustomed to the quagmire of historic mysteries, Strike finds himself drawn into the web of a forty-year-old enigma. Accompanied by his partner, Robin Ellacott, who is entwined in personal battles of her own, they untangle leads steeped in tarot mysteries, a psychopathic killer, and deceitful witnesses. As they edge closer to the truth, the cold embers of the old case threaten to ignite a deadly blaze, proving that time does not erode the peril of an unsolved crime.