After a long winter cooped up in the lighthouse, Whistler and Lila are excited to go outside and explore. In the forest, they see some frosty vapor rising from a hole in the roots of a tree. They investigate and discover that it's a hibernating bear. The mouse children wait patiently for the bear to wake up and when he does, they invite him for breakfast at the lighthouse. But their new friend might not be quite done hibernating...