When Jim and Charlie overhear two of their teachers talking in a secret language and the two friends set out to solve the mystery, they do not expect the dire consequences of their actions.
Editions · 5
Ebook
2009 · RHCB
EN
9781407050386
Ebook
2010 · Random House Children's Books
EN
9780375893643
Paperback
2010 · David Fickling Books
194 pp · EN
9781849920131
Paperback
2011 · A Yearling Book
194 pp · EN
9780385752244
Paperback
2014 · Penguin Random House
208 pp · EN
9781782953234
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