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The gang realise they need to break through a wall to get to the jewel - but can they do it without being discovered? And what will Agnes do when she finds out Gideon's been lying to her?
Lizzie discovers a secret tunnel with a clue, while the gang races Ambrose to find the jewel, and Hetty fears that Ashok is growing too friendly with Lady Grenford.
The gang are in danger when Rosamund leaves Lady Grenford and Ambrose in charge. Hetty finally cracks the code - but can the gang get to the Dawn Star in time?