'I believe I've come to the secret passage! The burrow must go right through one side of it!'
The Famous Five are staying at Finniston Farm for the holidays - where the ruins of an old castle once lay! The castle burned down years ago, but what happened to the dungeons and cellars underneath? It's time for the Five to discover the secrets of the castle - but someone is threatening to beat them to it ...
This softback book written by Enid Blyton with inside illustrations by Eileen Soper was originally published in Great Britain in 1960. This edition was published in 2016.