New York: Harper & Row, (1978) dj. SIGNED hardcover first edition - Langton's third mystery set at Harvard University in Cambridge, Massachusetts and featuring scholarly detective Homer Kelly, who happens to be on hand when someone bombs Memorial Hall during rehearsals for a Christmas performance of Handel's Messiah.. Illustrated with drawings by the author. SIGNED by Langton below the drawing facing the title page with "Kaboom!" printed above the illustration. First state with the 4 lines of garbled text on p. 11. 265 pp. plus a final drawing. Map endpapers. ISBN: 0-060125071.