If Hanks signs on the dotted line, he will once again team with director Ron Howard who is already onboard.  There is no word yet on who will play the leading lady in the film, cryptologist Sophie Neveau. 

The best selling book is a fast paced thriller where Langdon and Neveau go on a quest for the real Holy Grail, with come murder and intrigue tossed in for good measure. The book was adapted for the screen by Akiva Goldsman (A Beautiful Mind) and is expected to begin production next year. 

Since the character of Langdon is the hero of two of Brown's novels (as well as his next one), there is a possibility of a new series based on the books.