Stella Darnell was the detective's daughter. Now she's solving cases of her own.Jack Harmon craves silence and a bird's eye view. From his new home in Palmyra Tower, he can raise binoculars to watch over west London. If he watches for long enough, he will learn who has secrets. He will learn who plans to kill. But Jack does not see everything. A man has died beneath a late-night train, and Jack's friend Stella, the detective's daughter, suspects it could have been murder. Now Jack and Stella are stirring up the past with questions that no one wants answered—questions that lead to an unsolved case nearly 20 years old.

It is a year since her father's death, but Stella Darnell has not moved on. She still cleans his house every day, leaving it spotless as if he might return. Terry Darnell was Detective Chief Superintendent at Hammersmith police station, and now Stella has discovered an unsolved case in his darkroom: a folder of unlabelled photographs of deserted streets. The oldest photograph dates back to 1966. To a day when Mary Thornton, just ten years old, is taking her little brother home from school in time for tea. That afternoon, as the Moors Murderers are sent to prison for life, Mary witnesses something that will haunt her forever. As Stella inches closer to the truth, the events of that day begin to haunt her too...