Winston calls Guerrero, who informs him he has another job and that anyway, his life does not revolve around Winston. Winston needs a chopper pilot that Guerrero knows, but Guerrero says that they had a falling out and the only way he could apologize is if he had "a time machine or a hell of a Ouija board". Say, did you get that joke about how the chopper pilot had a "falling out"? Zing! Anyway, Guerrero hangs up on Winston and finishes picking a lock. Winston is vexed. Guerrero appears to be in the Firm's offices. And the offices look different from the first three episodes, I think.
On the mountain, goons unzip duffel bags full of C4. Chance also has one from the one he knocked out. It's "enough to level this place." Chance has to save the monks (the other monks are all being held hostage, which Chance somehow knows already) before the whole place blows up. Gray says that he knows that the Annals are in the crypts in the foundations of the monastery. The Abbott explains that the crypt is connected to the church by a series of tunnels built during prohibition. So that means the tunnels were built during the time there was prohibition in Quebec. In other words, between May 1, 1919 and May 1, 1921. But there's only one entrance inside the Abbey itself. It's just behind "where Fisher is holding the monks hostage". In other words, that church from earlier. John worries about moving the slab without being heard, since these places have pretty good acoustics. But the Abbott has a plan and scurries off to create a diversion.