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A rare virus known as African Hemorrhagic Fever has quarantined Magnum and Higgins at Robin's Nest. Their enforced stay coincides with the arrival of Higgins' former comrade-in-arms Edwin Clutterbuck (Ian McShane), with whom he served in Africa during the bloody Mau Mau uprising of 1955. Now, it seems that the members of Higgins' and Clutterbucks' regiment are being murdered one by one--and the killer may have slipped into the Masters Estate before the quarantine signs went up! After several minor roles in previous episodes, Gillian Dobb makes her first appearance as Higgins' English lady friend Agatha Chumley.