Monsieur Pamplemousse on Vacation — Michael Bond

Monsieur Pamplemousse is looking forward to a well-earned break in the South of France courtesy of his employer - all he has to do is collect a piece of artwork for Le Guide's Director. But when his contact fails to show and a dismembered body is washed up outside the hotel, the holiday mood evaporates.
As Pamplemousse struggles with the case (and with modern technology) his ever-faithful bloodhound Pommes Frites is on hand offering proof why, during his time with the Paris Sûreté, he was one of their top sniffer dogs.