My dear Reader, this "challenge" you will find at the end of Chapter XXXI of my novel. I wrote it because I felt I had given you by the time you reached that page every clue you'd need to crack the case. Here it is: 

"CHALLENGE TO THE READER
 
 
If you, reader, had really paid attention,
you should know by this time the culprit’s name
who’s to be immediately brought to detention.
But if to this point and clueless you came,
to the read pages you should put your mind
and prevent your brain from getting too lame.
The well-known country go back and behind
so that through the right map you make your way
and place the victims where death they did find.
Beware of not going too far astray
’cause you should fear any kind of mistake
letting justice not to sacred truth obey;
just a hint: your culture you must awake
and your wits too to get to the solution;
if your brain is on the verge of a break,
Use your intelligence’ best evolution
to start from the things you have got in store
which you’ve seen so far in this consecution:
a certainly unusual piano score,
barbecue on which slices of meat lay,
a strange knick-knack you’ve never seen before,
two containers filled with water and clay,
purse with coat-of-arms on and fist inside,
rotten egg that left your nose in dismay,
Franciscan habit that something implied,
of shining handcuffs one and only pair.
Please don’t let your patience be set aside,
but “seven” doesn’t solve it all, beware!,
and if you put all your faith in that thought
you will come up with nothing to declare.
In this kind of novel you know for aught;
sometimes there might be no, my reader dear,
apparent reason for the dead onslaught.
Grief and pain will never have limits here
just as much as death has ever had one.
If your intellect is starting to fear
that nothing is still fully said and done
giving way to another open door,
maybe your dutiful work’s just begun…
So I close here and dare to say no more."