Philanthropist and prominent Sherlockian David Masterson has rented Suffolk Gardens House, where he plans to entertain his friends in a traditional English country house weekend. As the caterers, Jayne Wilson and Gemma Doyle get to work preparing lavish meals and setting up entertainment. Meanwhile, police detective Ryan Ashburton has taken time away from his duties to assist in the kitchen. Following A Curiosu Incident, this seventh adventure turns deadly as it becomes apparent that David's guests don't like each other—or their host.