Study keypad log · Room 3-14Friday 17:00 to Saturday 08:00

Time	Code entered	Direction
17:30	1729	In
18:02	7919	In
18:40	7919	Out
19:15	6765	In
19:31	6765	Out
21:34	4096	In
21:49	4096	Out
07:12	2442	In

The keypad records codes, not names. No other entries. Kessler did not leave the study after 17:30.

Coroner's preliminary noteDr. P. Ocampo

Cause of death: cardiac arrest from digitalis poisoning, consistent with fresh foxglove leaves steeped in tea. Onset of symptoms usually 30 to 60 minutes after drinking. Time of death between 21:45 and 22:30.

The kettle contained clean water only. The poison was in the cup.

Useful facts, from the Inspector's dictionaryHe looked these up

Perfect square: a number times itself (like 49 = 7 × 7). Prime: divisible only by 1 and itself. Palindrome: reads the same backwards. Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13, 21... each is the sum of the two before. Taxicab number: the number Hardy rode in a taxi; Ramanujan said it was the smallest number that is a sum of two cubes in two different ways.