After pushing the door open to the next area investigate the sarcophagus.
Treasure #82 is up the stairs.
Continue to go through the house until you encounter the locked doors.
Go down to the bookshelf and move it.
Now climb up to the vent.
Get into the room, grab the key from the drawer unit.
Go unlock the door and open the other room with the key.
Have a friendly chat with the lady.
Next, just escape the police...
#81 Toy Soldier
Outside on the bench.
#82 Toy Seaplane
In the area with the sarcophagus. Up the stairs.
#83 Pirate Snowglobe
After moving the bookshelf to get to the air vent, climb all up and jump to the other side onto the balcony.