In an attempt to improve the lacklustre reputation of France's most prestigious culinary guide, Le Guide, in America, the director persuades Monsieur Pamplemousse to write a play for the guide's benefit, complete with a walk-on part for faithful bloodhound Pommes Frites.
Emphasising the importance of a healthy lifestyle to decrease one's carbon footprint, Monsieur Pamplemousse tries to impress the well-renowned American food-critic Jay Corby, whose positive review would revitalise the guide's credibility. But disaster strikes on opening night when a manoeuvre with a trapdoor causes Corby to storm out in a rage. Monsieur Pamplemousse must find him before he ruins everything for Le Guide.
Once again he can rely on star sniffer dog Pommes Frites, who is hot on the trail of their only lead: a flimsy undergarment belonging to an exotic dancer they came across in a state of undress before the start of the show ...
