A strange film, this, an uneasy mix of comedy and thriller in which neither genre really excels. It follows the arrival of a plane in London where it transpires that one of the passengers is sick with smallpox; at this point the man from WHO, an unusually cast Terry-Thomas, has to try to stop a forthcoming pandemic. A good cast keeps this well acted throughout, but the romantic interludes and humour sits oddly with the race-against-the-clock style plotting. I found it a bit of a chore in the end.