This is how it works. Neil Gaiman has written the opening line and you are invited to finish it. Take it in any direction you like by posting your contribution – however strange or short – in the comment thread.
Here's my belated attempt
As he stood gazing at the back door in disbelief, he recalled the summons to work, which had hurried his breakfast and prevented him from enjoying his crunchy, hot toast and blackcurrant jam. Rushing to dress he no longer had time to marvel at the day’s crossword puzzle that his broadsheet had to offer.
Lucifer, the neighbour's cat, liked to sit on the boundary wall giving Gerald 'the evil eye'. Gerald shuddered trying to forget the details of the morning so far. Things could only get better, he determined and today he had had enough of that cat!
"Clearoff!" he growled in the cat's direction, gesticulating his arms in as menacing a manner as possible.
"Is that the best you can do when there's a murder to be solved?" asked the cat, sounding like Lucius Malfroy from the Harry Potter films.
Gerald narrowed his eyes and scoured the wall for signs of his neighbour, Giles, the amateur dramatics aficionado.