Murder on the the Thirty-first Floor

In an unnamed country, in an unnamed year sometime in the future, Chief Inspector Jensen of the Sixteenth Division is called in after the publishers controlling the entire country's newspapers and magazines receive a threat to blow up their building, in retaliation for a murder they are accused of committing. The building is evacuated, but the bomb fails to explode and Jensen is given seven days in which to track down the letter writer.

Jensen has never had a case he could not solve before...