Try these books also by Dan Brown:
Angels and Demons:
Read how it all began in the first in the series about the adventures of Robert Langdon. Can I interest you into to reading the book with this synopsis...
CERN Institue, Switzerland: a world renowned scientist is found brutally murdered with a mysterious symbol seared onto his chest.
The Vatican, Rome: the College of the Cardinals assembles to elect a new pope. Somewhere beneath them, an unstoppable bomb of terrifying power relentlessly counts down to oblivion.
In a breathtaking race against time, Havard professor Robert Langdon must decipher a labyrinthine trail of ancient symbols if he is to defeat those responsible-the Illuminati- a secret brotherhood presumed extinct for nearly four hundred years, rebor to continue their deadly vendetta against their most hated enemy, the Catholic Church...
The Lost Symbol:
The third in the series about the endeavours of the hero Robert Langdon.Can I entice you into reading this next installment...
The Capitol Building, Washington D.C: Havard symbologist Robert langdon believes he is here to give a lecture. He is wrong. Within minutes of his arrival, a shocking object is discovered. it is a gruesome invitation into an ancient world of hidden wisdom.
When langdon's mentour, Peter Solomon-prominent mason and philantropist-is kidnapped, Landon realises that his only hope of saving his friend's life is to accept the mysterious summons.
It is to take him on a breathless chase through Washington's dark history. All that was familiar is changed into a shadowy, mythical world in which Masonic secrets and never-beroe-seen revelations seem to be leading him to a single impossible and inconceivable truth...
Also try Digital Fortress and Deception Point, which are very similar to the Robert Langdon books only with two different female heroines...