The Question of the Painted Cave
(1965)(The fourth book in the Lester and Westcott children series)
A novel by Winifred Mantle
" The lively Lester and Westcott children of The Hiding Place, Tinker's Castle, and The Chateau Holiday find themselves in the thinck of trouble once more in this exciting new adventure set in the south of France."
Used availability for Winifred Mantle's The Question of the Painted Cave