George is not pleased when Berta, a spoilt American girl, turns up at Kirrin Cottage in the middle of the night dressed in disguise! But George hasn't got time to be jealous. Berta is in hiding from kidnappers, and she needs help. The Famous Five must risk danger to help out this stranger.
Groan. Another girl-trying-to-be-like-a-boy story! First George, then Jo in Five Fall Into Adventure, then Henry in Five Go To Mystery Moor... The joke is in danger of not being funny anymore! But luckily Berta is quite different to George, Jo, and Henry in that she doesn't want to become a boy; she is reluctant to have her golden locks cut off, but must in an effort to disguise herself in case kidnappers spirit her away.