When SPEARS receives an emergency distress call from its marine outpost in Antarctica, there is only one team they can send. Agnes and Attie are soon up to their eyes in an icebound mystery. What is causing the tremors threatening to destroy the rescue centre? Why are the local Adelie penguins behaving so bizarrely? And what exactly is the celebrity nature presenter Cynthia Steelsharp doing, out there in the ice-fields?