The Last Templar - Raymond Khoury

In 1921, a young templar flees the fallen holy land, setting out to sea with a mysterious chest entrusted to him by the Order's dying grand master. The ship vanishes without a trace. In present-day Manhattan, 4 masked horsemen dressed as Templar knights stage a bloody raid on the Metropolitan Museum of Art during an exhibit of Vatican Treasures.

A truly satisfying Historical thriller! - Glamour.