Solo and agent Andreas Petros (Robert Wolders) are sent to the island of Ibos, where the Technological Hierarchy for the Removal of Undesirables and the Subjugation of Humanity has been spending huge amounts of money on some unknown project. Solo, posing as a visiting THRUSH official, meets Dr. Killman (John Larch), the head of the project, and Marnya (Barbara Luna), who reveals that Killman is working on an earthquake device, as the real THRUSH emissary arrives.