1Loyalty as armour
The gang's first move is to drug Timmy, because everyone understands the dog is the children's real defence. George's distress at finding him unconscious is not sentiment; it is the sound of a shield being lowered. The book answers that attack in kind: Timmy wakes, recovers, and his attack on a kidnapper in the tunnels is the hinge of the whole escape. Loyalty here is not a feeling but a working system, tested and proven. The point is simple and firm: the Five survive because they, and their dog, never leave each other behind.
Characters:GeorgeTimmy
2Jealousy and the newcomer
George resents Berta from the moment the plan is announced: her home, her family's attention, handed to a stranger in boys' clothes. Berta's nervousness and clinginess make it worse, and George's scorn for Sally the poodle is scorn by proxy. The bed-swap that gets George kidnapped is, ironically, an act of generosity or whim, not rivalry. By the final picnic, George admits Berta is 'not so bad after all'. The book's point is that resentment melts fastest when shared danger proves the newcomer is on your side.
Characters:GeorgeBertaSally
3The outsider who saves everyone
Jo is everything the Five are not: wild, poor, gypsy, uninvited. Yet she is the one who warns them about Red Tower, slips a note under the door when George vanishes, guides the boys through a cave into the house, and rides alone to raise the police. The children agree at the end that Jo was the real heroine. Blyton's point is that courage does not come with a respectable address, and the person you almost dismiss may be the one who brings you home.
Characters:GeorgeJo
4Children against the adult world
The adults in this book are either absent, deceived or endangered: Uncle Quentin is the target of the plot, Aunt Fanny can only telephone the police, and Mr. Wright is helpless without his secrets. The actual rescue is planned and carried out by children, on bicycles, through a hidden passage, with a dog for a weapon. Even the wait in the tunnels is endured without adults. The book's point is that in Blyton's world, competence belongs to the young, and grown-ups are mostly people to be warned, rescued or thanked afterwards.
Characters:Uncle QuentinMr. Elbur WrightAunt Fanny