Sunday the 21st.
Dr. Halvorsen,
You answered in three words, which is your way of shouting. A card folded into an unstamped envelope, slipped under the street door on Tuesday morning, and on the card: Since March 14th. No year. No signature. You knew I'd do the arithmetic, and you wanted me to be the one who did it, because a number you are given is only a number, whereas a number you find is a cut.