"Poisoner's Ring" is a captivating novel that transports readers to Victorian Scotland in 1869. The story follows Mallory Atkinson, a modern murder investigator who works as an assistant to a funeral director and finds herself in the role of Catriona Mitchell. As she navigates her new surroundings, Edinburgh is plagued by a serial killer who is murdering the city's men with a deadly poison. The widowed women come under suspicion, and Mallory must maneuver through a web of intrigue and accusations as she seeks to uncover the truth. With the support of Dr. Duncan Gray, a medical examiner, the hunt for the murderer becomes a race against time. Bestselling author Kelley Armstrong masterfully brings to life the atmosphere and challenges of Victorian life, immersing readers in a world full of mysteries and dangers.