Theo and Ellen accidentally break an ancient cat statue in the antique store. When they tell their mother Nic, she turns pale. It must have been the statue that ruined the life of their ancestor Nab Pincher!

The curse of the Egyptian cat turns thieves into honest people and honest people into thieves. Nab met a terrible fate for a Pincher - he became a police officer. Now suddenly Ellen can't lie and Theo is becoming a criminal. Theo and Ellen follow the clues to break the curse - after sneaking into the zoo through secret tunnels, breaking into the antique store and digging his way into more trouble, Theo must decide whether he is or isn't a criminal.