LONDON. A bag of bones is found on the river Thames' foreshore in the early hours of June 2019. human skeletons. DCI After being summoned to the scene, Samuel Owusu sends the bag right away for a forensic analysis. The bones belong to a young woman who died from a head injury many years ago. A trail of clues is also contained in the bag, including the seeds of a rare tree that took DCI Owusu back to the Chelsea home where, some thirty years earlier, three people were found dead in the kitchen and a baby was waiting upstairs for someone to come and get her. The hints also lead to a brother and sister who are looking for the only person who can make sense in Chicago.