First published in This Week, May 3, 1964. Reprinted as Selena Robs the White House in the anthology Murder Most Foul edited by Harold Q. Masur, 1971.
The President of a newly democratized African nation has arrived in DC for meetings and to extend a gift to the First Lady, a beautiful powder music box. Since it had gone missing briefly in transit, Section Q is certain something bad had been done to it and asks Selena Mead to investigate. Bad, indeed.
Note: this story had sadly been submitted on November 21, 1963, the day before the assassination of JFK. In respect to the slain President and a grieving nation, it was held for several months before being published.