Zoom into the barrel; take the CANNONBALL (I).
Zoom into the fountain; insert the CANNON BALL into the hole (J) and turn the handle (K).
Move forward twice.
Take the MAP (L).
Move forward, walk down, turn left, and move forward.
Talk to the man (M).
Walk down twice.
Zoom into the statue; take the ring (N).
Zoom into the carriage (O).
Access the necklace.