Agent Mitchell Loeb, a friend of Broyles' collapses on assignment, his heart being constricted by an engineered parasite which is slowly working its roots into his circulatory system. To find a cure, Olivia must talk to a prisoner held incommunicado in Frankfurt, Germany. Problems arise when the man demands to speak to a colleague of his in exchange, who is unfortunately killed in a raid set up by Broyles. Walter, however, devises a way to wire Peter into the dead man's brain, enabling Peter to speak on his behalf. The procedure is successful and the parasite is removed, but the team doesn't realize that the entire incident was set up by Loeb to get the information Peter extracted from the dead man.