Claudia and Clyde are twin brother and sister who look out for each other. Claudia takes extra care of Clyde because Clyde has a problem.  When he gets excited he turns into a monkey! Yes, a monkey.  Young readers of this book will enjoy the absurdness of this morphing.

This is book three in the series. Here we find that the twins have a new neighbor. Nightmare of nightmares, it is their school Principal!  Clyde and Principal Murphy soon find something in common that helps them to begin a friendship. They also catch burglars who, unbeknownst to Principal Murphy, have stolen her valuable baseball cards and worse, her beloved cat.