Five on Finniston Farm
Enid Blyton
 In this novel, the five children (Julian, Dick, George, Anne and Timmy), visit Finniston farm, where they discover ancient ruins of a medieval castle. Whilst they solve this mystery, they are helped by two twins called the two Harries (Henry and Harriet), who are known by their ability to speak in unison, and held up by a family of arrogant, rude and rich Americans, Mr Henning and his spoilt son Junior, one of which an angry Grandfather threatens with a sword.