Midsomer biscuit tycoon Eric Calder stays at a hotel located at the large City Hall Square (Rådhuspladsen) during a visit to Copenhagen.
As the goods were sent from Midsomer, Danish detective Birgitte Poulsen asks Barnaby to investigate.
DCI Barnaby and DS Nelson start their investigation at home, but when a second body ends up at a Danish biscuit factory in a shipment from Midsomer, they have to take a flight across the North Sea.
Barnaby, Nelson, and their Danish counterparts uncover a second life for the first victim in Copenhagen, one that circles back to Midsomer.
The plot revolves around a recipe for Danish-style butter cookies, and includes elements borrowed from Hamlet, a classic British drama set in Denmark.