So cold! And so much snow! Mimi Kätt, a snow-white and very clever cat lady, doesn't want to leave her cosy little basement flat. And that's despite the fact that a nasty muddy-brown pug has placed his poop right in front of Mimi Kätt's window. And now even a huge ocean liner is frozen in the canal in front of her flat! "How can that be?" marvels Mimi Kätt. But when she then meets the captain and the sailors of this mysterious steamer, with whom one can sing such wonderful songs all day and all evening, nothing really surprises her any more, and she enjoys the most beautiful and craziest winter of her cat's life together with the sailors.