The three investigators, aided by their friend Allie, try to untangle the unusual circumstances surrounding an abandoned silver mine.
Editions · 5
Paperback
1980 · Armada
158 pp · EN
9780006915744
Paperback
1984 · Random House
151 pp · EN
9780394864242
Paperback
1984 · HarperCollins Publishers
144 pp · EN
9780006923688
Paperback
1984 · HarperCollins Publishers
144 pp · EN
9780006923688
Paperback
1985 · Random House Books for Young Readers
151 pp · EN
9780394864242
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