I liked it.  There’s something every so very childlike in the simplicity of both story and illustrations. It’s rather Madeline-esque.  A rhyming tale set in London of a boy venturing through the city to visit the possum exhibit at the London zoo, while dragging his doggy pull-toy behind him, never noticing that when he left the exhibit, the five baby possums followed nose-to-tail with the doggy all the way home again.  The young boy takes it all in stride and is busy fixing a picnic for his guests when they next grab onto the string of some helium balloons, which end up carrying them right back home again.