When Harold Waterman serves a beautiful woman in his second-hand emporium, he doesn't know that she's the Angel of Pestilence or see her oil-coloured wings caressing his cheek. Diagnosed with a sudden terminal illness, he breaks down and cries on his mum's apron. To console him, she gives him a trunk that his absent father left behind when he was born.
Inside the trunk is a book which tells him how to summon the demon Jasfoup, a pair of animate gargoyle daggers and a lollipop.
Jasfoup promises to help Harold and gives him the Sight, by which he can see everything that the human mind had been trained to ignore. Harold finds that beneath the veneer of a north-London suburb lies everything he thought was a fairy story: Ghosts (his Uncle Frederick refused to go to Heaven because they had a No Smoking policy), Vampires (he'd always thought that there was something odd about Mr. Isaacs) and Angels.
It was the angels that he was most worried about; they kept coming after him with very sharp swords.
"That's because you're Lucifer's lad," said Jasfoup. "Didn't your mum mention it?"
"That I was the son of the Lord of Hell?" Harold shook his head. "I don't think so. I'm sure I would have remembered that."
So...what's the novel about? Dealing with being the son of Lucifer? Cause you might want to lead with that if it is.
And given how Miss Snark feels about Ol' Nick what's the problem.
Focus. Start over.