Mr. Pin, the rockhopper penguin who has traveled from the South Pole to be a detective in Chicago, investigates two cases involving chocolate. Sequel to "The Mysterious Cases of Mr. Pin.".
Riley accompanies Uncle Max, Aunt Martha, and Cousin Alice to Antarctica, the coldest place on earth, to investigate the diet of the penguins there to see whether it has changed because of rising ocean temperatures.
Tired of just pretending to be a Wild West bandit, a little mouse named Tugford decides to do something really bad. Little Penguin sneaks off on an exciting adventure in the Antarctic wonderland only to come face to face with great peril.
Penguin helps organize the annual talent show because he cannot identify his own gift, but when the show is over and the performers throw a party to show how much they appreciate Penguin's work, his aptitude becomes clear.