There seems to be an awful lot in Clarice's life to worry about and when she finds herself unable to sleep at night, she follows Ruby Redfort's advice and devises a Worst Worries list. But Clarice soon realises that your worst worry is the worry you haven't even thought to worry about. And, as Clarice's world dissolves into chaos and confusion - falling down house, arguing parents, and another term with Mrs Wilberton - she realises just how true this is...