A masterfully crafted detective novel by Robert Galbraith and the fifth book in the Cormoran Strike series.

Private investigator Cormoran Strike is approached by Anna Phipps, whose mother, Dr. Margot Bamborough, disappeared without a trace in 1974. Although the case is nearly forty years old and widely believed to be unsolvable, Anna hopes Strike can uncover the truth that has haunted her family for decades.

Together with his investigative partner Robin Ellacott, Strike reopens the cold case. As they sift through old police files, witness statements, personal diaries, and forgotten clues, they discover connections to a notorious serial killer, complicated family relationships, occult beliefs, and long-buried deceptions. The deeper they dig, the more they realize that solving a decades-old mystery can be just as dangerous as investigating a current crime.

Alongside the central investigation, the novel continues to develop the personal lives of Strike and Robin, exploring their evolving partnership, family struggles, and emotional complexities. With meticulous plotting, richly developed characters, and numerous red herrings, Troubled Blood delivers one of the most intricate mysteries in the series.