Inferno: (Robert Langdon Book 4)

of three-headed Satans from various works of art—Botticelli’s Mappa , the Florence baptistry’s mosaic, and Andrea di Cione’s terrifying black demon, its fur soiled with the crimson blood of its victims.
    “Together,” Langdon continued, “we have climbed down the shaggy chest of Satan, reversed direction as gravity shifted, and emerged from the gloomy underworld … once again to see the stars.”
    Langdon advanced slides until he reached an image he had shown earlier—the iconic Domenico di Michelino painting from inside the duomo, which depicted the red-robed Dante standing outside the walls of Florence. “And if you look carefully … you will see those stars.”
    Langdon pointed to the star-filled sky that arched above Dante’s head. “As you see, the heavens are constructed in a series of nine concentric spheres around the earth. This nine-tiered structure of paradise is intended to reflect and balance the nine rings of the underworld. As you’ve probably noticed, the number nine is a recurring theme for Dante.”
    Langdon paused, taking a sip of water and letting the crowd catch their breath after their harrowing descent and final exit from hell.
    “So, after enduring the horrors of the inferno, you must all be very excited to move toward paradise. Unfortunately, in the world of Dante, nothing is ever simple.” He heaved a dramatic sigh. “To ascend to paradise we all must—both figuratively and literally—climb a mountain.”
    Langdon pointed to the Michelino painting. On the horizon, behind Dante, the audience could see a single cone-shaped mountain rising into the heavens. Spiraling up the mountain, a pathway circled the cone repeatedly—nine times—ascending in ever-tightening terraces toward the top. Along the pathway, naked figures trudged upward in misery, enduring various penances on the way.
    “I give you Mount Purgatory,” Langdon announced. “And sadly, this grueling, nine-ringed ascent is the only route from the depths of inferno to the glory of paradise. On this path, you can see the repentant souls ascending … each paying an appropriate price for a given sin. The envious must climb with their eyes sewn shut so they cannot covet; the prideful must carry huge stones on their backs to bend them low in a humble manner; the gluttonous must climb without food or water, thereby suffering excruciating hunger; and the lustful must ascend through hot flames to purge themselves of passion’s heat.” He paused. “But before you are permitted the great privilege of climbing this mountain and purging your sins, you must speak to this individual.”
    Langdon switched slides to a close-up of the Michelino painting, wherein a winged angel sat on a throne at the foot of Mount Purgatory. At the angel’s feet, a line of penitent sinners awaited admittance to the upward path. Strangely, the angel was wielding a long sword, the point of which he seemed to be stabbing into the face of the first person in line.
    “Who knows,” Langdon called out, “what this angel is doing?”
    “Stabbing someone in the head?” a voice ventured.
    “Nope.”
    Another voice. “Stabbing someone in the eye?”
    Langdon shook his head. “Anyone else?”
    A voice way in the back spoke firmly. “Writing on his forehead.”
    Langdon smiled. “It appears someone back there knows his Dante.” He motioned again to the painting. “I realize it looks like the angel is stabbing this poor fellow in the forehead, but he is not. According to Dante’s text, the angel who guards purgatory uses the tip of his sword to write something on his visitors’ foreheads before they enter. ‘And what does he write?’ you ask.”
    Langdon paused for effect. “Strangely, he writes a single letter … which is repeated seven times. Does anyone know what letter the angel writes seven times on Dante’s forehead?”
    “P!” shouted a voice in the crowd.
    Langdon smiled. “Yes. The letter P . This P signifies peccatum —theLatin word for ‘sin.’ And the fact that it is written seven times is symbolic of the Septem Peccata Mortalia, also known as—”
    “The Seven Deadly Sins!” someone else shouted.
    “Bingo. And so, only by ascending through each level of purgatory can you atone for your sins. With each new level that you ascend, an angel cleanses one of the P s from your forehead until you reach the top, arriving with your brow cleansed of the seven P s … and your soul purged of all sin.” He winked. “The