Breaking their promise could save a world... or destroy their own.
Becky and her friends are soon drawn into another adventure after visiting her mum's friend, Lizzie, who has seen something very strange in the lane behind her property.
Curious to uncover the truth, Becky and the others investigate - only to encounter something truly otherworldly. What they discover forces them into an impossible decision: they must excavate the Zeti Crystal... something they promised Skimblefire they would never do.
But the situation is urgent. The survival of an entire race of beings hangs in the balance.
Should they break their promise to Skimblefire? And what consequences will they face if they do?
Intricately entwined with their previous adventures, this story opens the friends' eyes to even more hidden realities. As they confront a desperate challenge, they may find themselves changing the very fabric of their own world forever.
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