Mission 4: The Royal Physician
Bone Charm 4-1
This first bone charm can be found across the draw bridge in the apartment there on the left side of the street.
Bone Charm 4-2
When you reach the door to go to North End, blink up to the apartment opening on the second floor on the left side. Follow the platforms down to the bottom level and there will be a bone charm to the left side of the area beside a corpse.
Bone Charm 4-3
Right at the beginning of North End, enter the building on the left side via there open doorway on the second floor. Go through the open door on the right and then blink up to the balcony above to enter another doorway. The bone charm will just be inside on the right side.