Mandor, a former high-ranking Thrush official, supposedly has defected to UNCLE. In reality, he is providing information that will weaken his enemies within Thrush; Mandor is angling to take over Thrush in a power play. However, a former Mandor associate is hunting him. Mandor arranges it so that Illya Kuryakin is captured, forcing UNCLE to kill the Thrushman hunting Mandor. Napoleon Solo must rescue Kuryakin and then deal with Mandor.