The Dante Death Mask's Journey
InfernoThe mask is stolen, hidden, discovered, and eventually returned to its display case.
increasing
Bearing strength in each event
decreasing
The Theft

The Mask Removed
The Secret Visit
Langdon and Busoni secretly remove the mask from its case in the Palazzo Vecchio. They discover a hidden message on the back and decide to take it for further study.
The Hiding
Busoni hides the mask in the Baptistry of San Giovanni, inside the baptismal font, before his heart attack. The mask remains there overnight.
The Discovery
Langdon and Sienna retrieve the mask the next morning, wiping away the gesso to reveal the spiral poem. The mask becomes the key to the plague's location.
The Return

The Mask Restored
The Package from Sinskey
After the crisis, Langdon requests the mask be returned to Florence. Sinskey arranges for its shipment. Langdon receives it at his hotel in Florence.
The Quiet Replacement
Langdon enters the Palazzo Vecchio museum and places the mask back in its display case. He removes the closure signs, effectively returning the artifact to public view.
The Closure
This act symbolizes the end of the adventure. The mask is home, and the cycle is complete.
Night of March 17
After the Istanbul events