Outbreak — Lionel Black

Dr. David Gregson was searching desperately for anyone who had come into contact with Filangieri during the three days since he had flown into London. For Filangieri had come down with smallpox. Gregson had fumigated and sealed the man's rented apartment. Now he had to trace and vaccinate his contacts, particularly two women who had been with him, to smother a smallpox outbreak before it could spread into a paralyzing epidemic.

That night Gregson was called hastily to Filangieri's apartment. It had been broken into. Masking himself, Gregson groped into the living room. On the carpet lay the body of a man who had been shot through the head...