A Spoonful of Poison, Part 1

S4 E4: Agatha, Roy, and Sarah attend the Fruit Preserve Festival, where Charles and James are two of the judges for the jam competition, and DCI Wilkes is one of the competitors. After a few rounds of tastings, however, the judges start to act out, hallucinating—and Dr. Stevens, believing she can fly, jumps from the roof. DCI Wilkes employs Agatha to find the killer, as he’s currently in the frame.