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Goldie Roth has been receiving letters from the Museum for the past few months. She is to become the Fifth Keeper. But does she really want to?

Six months have passed since the horrific events in Jewell. It seems that all the bad things are over, but when Bonnie, Towspit's sister, disappears, friends rush to her rescue.

Danger lurks at every turn, and the friends will have to remember all the skills they learnt at the Dant Museum.

The boat lurched, and Jewel's lights dissolved into the darkness. Everything ahead was swallowed up by darkness...