First American Edition, first printing. Signed by Elleston Trevor on the title page. A novel of suspense concerning a modern city threatened by a deadly smallpox epidemic. Trevor (1920-95), a British novelist, is remembered for his adventure story The Flight of the Phoenix (1964) and his series of Cold War thrillers featuring the secret agent Quiller, written under the pseudonym Adam Hall. Octavo. Original blue cloth binding, with yellow titles. The dust jacket is price-clipped, with some mild browning and wear along the extremities; otherwise very good.