Mumble's son, Erik, is struggling to realize his talents in the Emperor Penguin world. Meanwhile, Mumble and his family and friends discover a new threat their home -- one that will take everyone working together to save them.
On her first trip to Paris, a young woman hits a party in the Catacombs, the 200-mile labyrinth of limestone tunnels under the city that's lined with the remains of 7 million people. ...