In Nightfall, you learn that the Nazi spy, Dr. Clarke, was in pursuit of The Storm on the Sea of Galilee. After a very tense moment in Morocco, he fails to complete his quest, and Ian learns of the Knights Templar conspiracy. A few references are made later in Nightfall about the existence of this priceless work of art. In Interdiction, you will find out what happened to the painting, and better yet, why it was stolen.
The infamous history of this Rembrandt is scattered at best. In 1990, it was stolen from the Isabella Stewart Gardner Museum and has never been located. The FBI has been investigating the theft for 28 years, and has yet to solve the crime. Maybe Arklight will be able to track it down, #whodunnit!