These clues relate to Who Was Up at Night?
HINT 01
Both Eve and Esther heard someone walking about at 2AM
HINT 02
Sue mentions in her letter taking medication for her insomnia
HINT 03
The sleep medication box contained 21 tablets, and the course began on 24/3
HINT 04
The only signs of intrusion the police could find was on Monday morning
Still totally stuck? Here’s the answer
ANSWER
The course of 21 tablets would’ve meant 13/4 was the last day Sue took one, meaning she was fast asleep that night. Assuming Eve and Esther would’ve awoken Stubby, and as no signs of a break-in were found, the person who got up must’ve been Stubby himself.