Mr. Filkins in the Desert

When Mr. Filkins sets off for his ninetieth birthday party, he has no idea how eventful the journey will be. Crossing the desert to visit his family, armed only with a picnic, a walking stick, and an umbrella, Mr. Filkins faces (and hides from) many remarkable dangers. Luckily he has in his backpack something quite ordinary that turns out to have extraordinary powers--