The voyage of the Zeitgeist was plagued with assassins - hashashin, Raj murder-proxies, ninja... some seeking to kill delegates, others to crash the airship. In the end, the source was discovered to be a group of Wolves' Children using brainwashing, blackmail, and theft to motivate the assassins, hoping to stir up an incident which would plunge Prussia into war.

He'd know ALL about the assassination plot, but probably be baffled as to the identity of the people who thwarted it. Up to you if he was involved in plotting the mission or not.