In the City of the Ghosts (A sky that dreamt)

When Detective Drill got on to this endevour, given the facts even his boss decided to change the word "case" for "endevour", everybody promised him to light a candel and pray for his venture to become easy to resolve.
There was not a poem its name, a sky that dreamt, it could be easier in that way. Let's say our girlfriend dreaming to love us, but it resulted that a proof sent by post without nobody yet discover sender at all gave them a clear idea: they were in charge to discover that crime.
At beginning of the work, Drill just keep a morning seeing that only unargumentable proof. When he "woke up" it was lunch time, so invited her...