THE FOUR STATUES SOLUTION

 
When you were alone in Mia's apartment did you examine everything? Did you leave taking the photo out of her album till last? If you did, you would have noticed the top half of a silver apple on the bookshelf in her bedroom.
 
Mia's apartment is locked and you have to get her keys. You told Richard to look after her so she should be at the gallery. Go to the gallery and get her apartment key from her.
 
If you watched closely when you removed the photo from her photo album, you would have seen that there was a folded note underneath it. You must take both the top half of the silver apple and the note from her apartment. The note (in the documents section of your inventory) reads as follows:
 

LET US BE BEHIND A VEIL, LEFT TO OUR SECRET DESIGNS THEN PRESENT ME WITH THE OBJECT OF YOUR DESIRE AND
I WILL SHOW YOU THE MEANING OF TEMPTATION. BE READY, BECAUSE PASSION WILL FLOW LIKE THE BLOOD THAT RUNS THROUGH YOUR VEINS, AND AT THE END YOU WILL BE READY
TO WELCOME THE BLISSFUL PAIN THAT WILL OPEN TO YOU,
A NEW WORLD.

 
Analyze the wording and note the references to the four statues.
 
 (a) BEHIND A VEIL... SECRET DESIGNS - Queen of Secrets
 (b) THE MEANING OF TEMPTATION - Lady Temptation
 (c) FLOW LIKE THE BLOOD - the Baroness of Blood
 (d) AT THE END... WELCOME THE BLISSFUL PAIN - the Mistress of Pain
 
Combine the two halves of the silver apple in your inventory. You also have the silver rose that you found at the latest crime scene. If you haven't already done so, take the silver mask hanging on the wall in the area next to the steam bath. When you remove the mask you'll see a silver nail in the wall, which you must also take.
 
The four silver items must now be 'given' to the statues in the same sequence as referred to in the note.
 
 (a) Put the silver mask on the face of Queen of Secrets (3rd statue)
 (b) Place the whole silver apple in the serpents mouth - Lady Temptation (2nd statue)
 (c) Put the silver rose in the Baroness of Blood's mouth (1st statue)
 (d) Finally, insert the silver nail in the outstretched palm of the Mistress of Pain (4th statue)