At last!
The story is about a detective who searches dreams for clues. He investigates a theft brought about by a demon, the theft of the Sceptre of St. Ezra, a relic kept in the Church of the Pillar of Cloud.
He is faced with many curious obstacles: an invisible curse, a monster that can turn itself to adamant, a shadow that is cast by nothing, a computer error, etc.
He also makes one very curious friend.
Here’s the cover!

(I’ll probably still be doing a few edits on it).