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Meet the continuation of the detective adventures of Einstein the penguin and his friends in the second part of Einstein the Penguin. The Case of the Fish Detective!"

Imogen and Arthur have been missing Einstein since he returned to the Sydney Zoo. And they seem to miss having a new detective case to work on. So when the opportunity arises to meet up with their penguin friends Einstein and Isaac again, the Stewart family is happy to join in. Who would have thought that it would end with the kidnapping of their feathered friends? And what does Bill Hunter have to do with it? Imogen and Arthur plunge into a new investigation.