Brown, Dan - The Secret of Secrets

Accompanying celebrated academic Katherine Solomon to a lecture she's been invited to give in Prague, Robert Langdon's world spirals out of control when she disappears without trace from their hotel room.  Far from home and well out of his comfort zone, Langdon must pit his wits against forces unknown to recover the woman he loves.
But Prague is an old and dangerous city, steeped in folklore and mystery.  For over two thousand years, the tides of history have washed back and forth over it, leaving echoes of everything that has gone before.  Little does Langdon know that he is being stalked by a spectre from that dark past.  He must use all of his arcane knowledge to decipher the world around him - before he too is consumed by the rings of treachery and deception that have swallowed Katherine.
Against a backdrop of vast castles, towering churches, graveyards buried twelve deep and labyrinthine underground passages, Langdon must navigate a shadow city hiding in plain sight, a city that has kept its secrets for centuries and will not readily deliver them.  This is a battlefield unlike any he has previously experienced, one where he must fight not only for his own life, but for the future of humanity itself.

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