In her diary, Joyce writes that while people should not speak ill of the dead, “there are exceptions to every rule” and Ian falls under that. She says that everyone has their day one day, and yesterday was his, so while “it is sad that he is dead, it hasn’t made [Joyce] sad” (127-28). Elizabeth claims Ian was murdered, and Joyce believes her. Chapter 55 reveals the cause of Ian’s death, with Chris stating he died due to a fentanyl poisoning overdose that was “delivered into the muscle in his upper arm” (129). Perspective is shifted back to the Thursday Murder Club in Chapter 56, with Elizabeth remarking how wonderful it is that they all got to be witnesses to a murder. Elizabeth tells them it was fentanyl poisoning, which she learned through “a man who has access to the email correspondence of the Kent Police Forensic Service” (130). The group comes to the conclusion that someone who was there the day Ian died must have killed him, and that they are somewhere in the photographs that were taken that day; they are all suspects. After some work, the group narrows down the list of suspects to 30 people, themselves included.