The Jovian moon Io is considered extremely hostile to life due to its lava flows, sulfur lakes, radiation fields, and constant volcanic eruptions. But is there really a danger there that threatens all of humanity? A mysterious being discovered on Enceladus warns of this urgently. The crew of the International Expedition, actually on their long-awaited journey home, reluctantly embarks on the risky mission to Io. However, suddenly a foe from within threatens to destroy all their hopes of leaving the hellish moon alive. Following the hard-SF bestsellers "Enceladus" and "Titan," this is the third part of the Ice Moon series, which can also be read independently. Brandon Q. Morris, a physicist and space specialist, describes the journey of the International Expedition based on the latest scientific findings and real technological trends.