In Victorian London, detectives Colin Pendragon and Ethan Pruitt are tasked with investigating whether the death of Adelaide Endicott, the elderly sister of a senior Parliament member, from a fall at Layton Manor was a suicide or murder. Despite Scotland Yard’s conclusion of suicide, Adelaide’s sister, Eugenia, insists on foul play. The investigative duo delves into Adelaide’s psychological state and potential motives for her death, uncovering a family history filled with scandalous secrets, abuse, and trauma. Evidence points to a sinister presence at Layton Manor, highlighting the need to reveal the truth to prevent further tragedy.