"I'll teach you to swim like a dog," said Marty.
But I don't want to swim like a dog! I don't even like dogs!
Sheila hates swimming. And dogs. And ghosts. And thunderstorms. She'll do anything to avoid these things - except admit that she's scared!
Her new friend Mouse Ellis thinks she's chicken. But Sheila is determined to show everyone that she really can be 'Sheila the Great'.
