In 1935, when his train is stopped by deep snow, detective Hercule Poirot is called on to solve a murder that occurred in his car the night before.

Bourne is brought out of hiding once again by reporter Simon Ross who is trying to unveil Operation Blackbriar, an upgrade to Project Treadstone, in a series of newspaper columns. Information from the reporter stirs a new set of memories, and Bourne must finally uncover his dark past while dodging The Company's best efforts to eradicate him.