The Secret of Grey Walls
The Lone Piners, including Jon and Penny Warrender, head for Clun in this winter adventure and they stay at Agnes Braid's sister's guest house.
They make the Clun Castle HQ3, as they discover sinister characters, missing sheep and removal lorries.
First published by Newnes, 1947
248 pp, Price 7/6, Illustrator Bertram Prance
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