The Mystery of the Burnt Cottage
 The novel centres on the mystery of who could have set fire to Mr Hick’s cottage. The five children, Larry and Daisy Daykin, Pip and Bets Hilton, and newcomer Frederick Algernon Trotteville (later nicknamed Fatty from his initials), meet at the scene of the fire and end up solving the mystery together. Their suspects include an old tramp, a dismissed servant, a hostile colleague, and the housekeeper. They find certain clues: Broken-down nettles in a ditch, a footprint in a grassy field, jet planes (by Mr. Hick’s seeing). The children realise that as Mr Hick claims to have been in the London train when the cottage was burnt, but by his own report he saw the planes which flew over the village at the same time, he is contradicting himself. Fatty finds out that the cottage and the burnt papers Mr Hick describes as 'most important' were insured. The children deduce that Mr Hick burnt his own cottage for the insurance money.