Baravian President Pablo Gomez and his wife Maria visit London. Their government suspects Baravian exiles may be plotting against them, and enlists John Drake to protect the couple. Drake soon gets word of a bomb which has been planted to go off. Most likely, the weapon’s targeting the visiting dignitaries. Drake has their residence checked thoroughly and questions every exile about the plot, but when nothing turns up, not even the Gomez’s are above suspicion.