Is the third novel in the Himalayan quartet. Brodie and Shane are called to a remote valley where they have a mysterious epidemic of something like chicken-pox or shingles. But several outbreaks are reported in India which trigger Brodie’s theory that they are being disseminated purposely.
When Brodie argues that birds are carrying the virus of the disease, he escapes being murdered by dacoits. His old SIS chief, Cready-Smythe, arrives with evidence of strange-looking aviaries in the Soviet Union. Brodie penetrates the camp on the Soviet-Chinese border where scientists are infecting birds with viruses and bacteria and programming them genetically to follow migratory paths.
With a blend of bluff and blackmail, Brodie rescues his boss from the Russians and destroys the camp and the birds before fleeing back into Hunza.


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