Who Is Killing the Great Chefs of Europe?

Natasha O'Brien is a celebrated pastry chef invited to London to assist in preparing a state dinner for the Queen. Her ex-husband, Robert "Robby" Ross, is a fast food entrepreneur ("the Taco King") serving the "everyman" consumer while she caters to the affluent. The killings are following the order of a meal, so Natasha will be the last to be killed.