Five go to Billycock Hill. Illustrated by Eileen Soper. London: Hodder & Stoughton, 1957. First Edition. Pp, 182. Good copy in red cloth covers, with no inscriptions, in illustrated dust jacket, lightly creased and chipped (price clipped).

Whilst camping on Billycock Hill, the Famous Five, accompanied by Toby, a friend from a local farmhouse, encounter a mystery surrounding a Secret airfield nearby, and the mysterious disappearance of two planes.

Sixteenth in the Famous Five Series.