Casper Cat and Susie Sheep are best friends. They play everything together. But when Milly Goat comes along, Casper always gets left out. One day Casper goes to the park with his mum. He sees lots of children playing tig and is over the moon when they let him join their game. But next time he sees Milly and Susie - they still won't let him join in! Poor old Casper, what will he do? Children will relate to this warm and reassuring story about the ups and downs of playground friendships.