Through the Cat-Flap

Thomas can't work out what goes on in the tiny minds of his toddler twin sisters. They sing all the time but never get the words right. They think cats enjoy being dressed up as fairies. But who else can Thomas turn to when they all get locked out of the house? Besides, it's a brilliant idea to pop them through the cat-flap and tell them to look for the keys. Isn't it ...?