Book fo Blood and Shadow by Robin Wasserman

Nora's happy life is shattered by a nightmarish evening that leaves one friend in a catatonic state, another dead and her boyfriend accused of murder. Nora resolves to prove her boyfriend's innocence and follows a violent trail to Prague, where she discovers a mysterious manuscript that purportedly offers the secret to ultimate knowledge and the ability to communicate with the divine and thus control the world. This story reminds me of the Da Vinci Code with ancient manuscripts, mysterious robed men, murder and cyphers and is an excellent adventure with a detailed plot of twists and turns.