Oh dear, Leo, you really are a party pooper! Come on, make up with your friends again. Leo Lausemaus may be a little mouse, but he is just like all the other little children in this world. Leo wants to win every game more than anything. It's not easy to understand that sometimes his friends can do things a little better than he can. This story, beautifully illustrated and filled with loving texts, tells us where it leads when such a mischievous little mouse is just angry about it.