25000
Sam's holiday with his friends Zara and Ben is interrupted when a bedraggled traveller blows in on a storm, reawakening a mystery from their Great Uncle Alexander's past. For thirty years, the remote Arctic island of Nordbergen has remained desolate and uninhabited. Now, strange aircraft have been seen landing and armed guards patrol the island's fringes. Professor Murdo has returned to Nordbergen to complete his secret and deadly work.

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