Knights of the Black and White — Jack Whyte

A brother of the Order--a medieval secret society uniting noble families in a sacred bond--Sir Hugh de Payens has emerged from the slaughter of the First Crusade a broken man seeking to dedicate his life to atonement, and to God. But the Order has other plans for the knight and his brethren. They must embark on a search for the Order's hidden treasure and the true roots of the society, protected for thousands of years in a location deep within the Temple Mount of Jerusalem. It's an insane task, for which de Payens has devised a dangerous plan--one that could not only expose the Order's riches but also reveal a secret that could shatter the very might of the Church itself.