Jon leaned over the parapet of the old mine and shouted, "Hi! Anybody down there?"
His voice boomed and echoed down the shaft, but the only sound to break the silence was the distant drip of water far below.
"Very odd," he said. "Can you see a light?
Maybe it is pot holers".

David shouted down the shaft again, but only the echoes came back to them. "None of our business, I suppose, but it seems peculiar to be exploring an old mine on a day like this."

But the situation in which the Lone Piners, holidaying in Yorkshire, soon find themselves turns out to be much more than peculiar, and the mysterious visitor to the old mine on the land Harriet Sparrows grandfather is buying becomes very much their business.

An astonishingly good offer is made to Mr Sparrow for the mine, too good to be true, and he does not want to sell anyway. What is more, the irrepressible twins Dickie and Mary are sure they recognise the voice of the man making the offer. Just what is the secret of the old mine? And who is the strange young man who is determined to show them the deserted village of Coram Street high on the Yorkshire Moors. And where does the sinister Miss Wildblood fit into the picture? And then Harriet and Mary disappear, and a threatening letter arrives for Grandpa Sparrow . . . The other Lone Piners go into action on his behalf, and the ensuing adventure taxes all their skill and courage.

Another exciting and complete story in Malcolm Saville's deservedly popular Lone Pine Adventure series.

ISBN: 0 86391 114 5
243pp Hardback
Our RRP £7.25